ARM: at91: collect SoC sources into mach-at91

This commit moves source files as follows:

  arch/arm/cpu/arm920t/at91/*   -> arch/arm/mach-at91/arm920t/*
  arch/arm/cpu/arm926ejs/at91/* -> arch/arm/mach-at91/arm926ejs/*
  arch/arm/cpu/armv7/at91/*     -> arch/arm/mach-at91/armv7/*
  arch/arm/cpu/at91-common/*    -> arch/arm/mach-at91/*

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Andreas Bießmann <andreas.devel@googlemail.co>

include/configs/sama5d3_xplained.h

@@ -227,7 +227,7 @@
 #define CONFIG_SYS_MONITOR_LEN		(512 << 10)
 
 #ifdef CONFIG_SYS_USE_MMC
-#define CONFIG_SPL_LDSCRIPT		arch/arm/cpu/at91-common/u-boot-spl.lds
+#define CONFIG_SPL_LDSCRIPT		arch/arm/mach-at91/u-boot-spl.lds
 #define CONFIG_SPL_MMC_SUPPORT
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS	0x400
 #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR 0x200

include/configs/sama5d3xek.h

@@ -274,7 +274,7 @@
 #define CONFIG_SYS_MONITOR_LEN		(512 << 10)
 
 #ifdef CONFIG_SYS_USE_MMC
-#define CONFIG_SPL_LDSCRIPT		arch/arm/cpu/at91-common/u-boot-spl.lds
+#define CONFIG_SPL_LDSCRIPT		arch/arm/mach-at91/u-boot-spl.lds
 #define CONFIG_SPL_MMC_SUPPORT
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS	0x400
 #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR 0x200