dm: Move Raspberry Pi driver model CONFIGs to Kconfig

Remove driver model CONFIGs from the board config header and use Kconfig
instead.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/Kconfig

@@ -839,6 +839,8 @@ endchoice
 
 source "arch/arm/cpu/arm926ejs/davinci/Kconfig"
 
+source "arch/arm/cpu/arm1176/bcm2835/Kconfig"
+
 source "arch/arm/cpu/armv7/exynos/Kconfig"
 
 source "arch/arm/cpu/armv7/highbank/Kconfig"

arch/arm/cpu/arm1176/bcm2835/Kconfig

+if TARGET_RPI
+
+config DM
+	default y if !SPL_BUILD
+
+config DM_SERIAL
+	default y if !SPL_BUILD
+
+config DM_GPIO
+	default y if !SPL_BUILD
+
+endif

include/configs/rpi.h

@@ -30,12 +30,6 @@
  */
 #define CONFIG_MACH_TYPE		MACH_TYPE_BCM2708
 
-/* Enable driver model */
-#define CONFIG_DM
-#define CONFIG_CMD_DM
-#define CONFIG_DM_GPIO
-#define CONFIG_DM_SERIAL
-
 /* Memory layout */
 #define CONFIG_NR_DRAM_BANKS		1
 #define CONFIG_SYS_SDRAM_BASE		0x00000000