arch: Make board selection choices optional

By making the board selections optional, every defconfig will include
the board selection when running savedefconfig so if a new board is
added to the top of the list of choices the former top's defconfig will
still be correct.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Cc: Tom Rini <trini@konsulko.com>

arch/arc/Kconfig

@@ -132,6 +132,7 @@ config ARC_CACHE_LINE_SHIFT
 
 choice
 	prompt "Target select"
+	optional
 
 config TARGET_DUMMY
 	bool "Dummy target"

arch/arm/Kconfig

@@ -64,6 +64,7 @@ config SEMIHOSTING
 
 choice
 	prompt "Target select"
+	optional
 
 config ARCH_AT91
 	bool "Atmel AT91"

arch/arm/cpu/armv7/exynos/Kconfig

@@ -2,6 +2,7 @@ if ARCH_EXYNOS
 
 choice
 	prompt "EXYNOS board select"
+	optional
 
 config TARGET_SMDKV310
 	select SUPPORT_SPL

arch/arm/cpu/armv7/mx5/Kconfig

@@ -12,6 +12,7 @@ config MX53
 
 choice
 	prompt "MX5 board select"
+	optional
 
 config TARGET_USBARMORY
 	bool "Support USB armory"

arch/arm/cpu/armv7/mx6/Kconfig

@@ -27,6 +27,7 @@ config MX6SX
 
 choice
 	prompt "MX6 board select"
+	optional
 
 config TARGET_SECOMX6
 	bool "Support secomx6 boards"

arch/arm/cpu/armv7/omap3/Kconfig

@@ -2,6 +2,7 @@ if OMAP34XX
 
 choice
 	prompt "OMAP3 board select"
+	optional
 
 config TARGET_AM3517_EVM
 	bool "AM3517 EVM"

arch/arm/cpu/armv7/omap4/Kconfig

@@ -2,6 +2,7 @@ if OMAP44XX
 
 choice
 	prompt "OMAP4 board select"
+	optional
 
 config TARGET_DUOVERO
 	bool "OMAP4430 Gumstix Duovero"

arch/arm/cpu/armv7/omap5/Kconfig

@@ -2,6 +2,7 @@ if OMAP54XX
 
 choice
 	prompt "OMAP5 board select"
+	optional
 
 config TARGET_CM_T54
 	bool "CompuLab CM-T54"

arch/arm/cpu/armv7/rmobile/Kconfig

@@ -2,6 +2,7 @@ if RMOBILE
 
 choice
 	prompt "Renesus ARM SoCs board select"
+	optional
 
 config TARGET_ARMADILLO_800EVA
 	bool "armadillo 800 eva board"

arch/arm/cpu/armv7/s5pc1xx/Kconfig

@@ -2,6 +2,7 @@ if ARCH_S5PC1XX
 
 choice
 	prompt "S5PC1XX board select"
+	optional
 
 config TARGET_S5P_GONI
 	bool "S5P Goni board"

arch/arm/mach-at91/Kconfig

@@ -2,6 +2,7 @@ if ARCH_AT91
 
 choice
 	prompt "Atmel AT91 board select"
+	optional
 
 config TARGET_AT91RM9200EK
 	bool "Atmel AT91RM9200 evaluation kit"

arch/arm/mach-bcm283x/Kconfig

@@ -3,6 +3,7 @@ menu "Broadcom BCM283X family"
 
 choice
 	prompt "Broadcom BCM283X board select"
+	optional
 
 config TARGET_RPI
 	bool "Raspberry Pi"

arch/arm/mach-davinci/Kconfig

@@ -2,6 +2,7 @@ if ARCH_DAVINCI
 
 choice
 	prompt "DaVinci board select"
+	optional
 
 config TARGET_ENBW_CMC
 	bool "EnBW CMC board"

arch/arm/mach-integrator/Kconfig

@@ -3,6 +3,7 @@ menu "Integrator Options"
 
 choice
 	prompt "Integrator platform select"
+	optional
 
 config ARCH_INTEGRATOR_AP
 	bool "Support Integrator/AP platform"
@@ -18,6 +19,7 @@ config ARCH_CINTEGRATOR
 
 choice
 	prompt "Integrator core module select"
+	optional
 
 config CM720T
 	bool "Core Module for ARM720T"

arch/arm/mach-keystone/Kconfig

@@ -2,6 +2,7 @@ if ARCH_KEYSTONE
 
 choice
 	prompt "TI Keystone board select"
+	optional
 
 config TARGET_K2HK_EVM
 	bool "TI Keystone 2 Kepler/Hawking EVM"

arch/arm/mach-kirkwood/Kconfig

@@ -2,6 +2,7 @@ if KIRKWOOD
 
 choice
 	prompt "Marvell Kirkwood board select"
+	optional
 
 config TARGET_OPENRD
 	bool "Marvell OpenRD Board"

arch/arm/mach-nomadik/Kconfig

@@ -2,6 +2,7 @@ if ARCH_NOMADIK
 
 choice
 	prompt "Nomadik board select"
+	optional
 
 config NOMADIK_NHK8815
 	bool "ST 8815 Nomadik Hardware Kit"

arch/arm/mach-orion5x/Kconfig

@@ -2,6 +2,7 @@ if ORION5X
 
 choice
 	prompt "Marvell Orion board select"
+	optional
 
 config TARGET_EDMINIV2
 	bool "LaCie Ethernet Disk mini V2"

arch/arm/mach-socfpga/Kconfig

@@ -2,6 +2,7 @@ if ARCH_SOCFPGA
 
 choice
 	prompt "Altera SOCFPGA board select"
+	optional
 
 config TARGET_SOCFPGA_ARRIA5
 	bool "Altera SOCFPGA Arria V"

arch/arm/mach-tegra/Kconfig

@@ -2,6 +2,7 @@ if TEGRA
 
 choice
 	prompt "Tegra SoC select"
+	optional
 
 config TEGRA20
 	bool "Tegra20 family"