Convert CONFIG_AT91SAM9260 et al to Kconfig

This converts the following to Kconfig:
   CONFIG_AT91SAM9260
   CONFIG_AT91SAM9G20
   CONFIG_AT91SAM9XE
   CONFIG_AT91SAM9261
   CONFIG_AT91SAM9263
   CONFIG_AT91SAM9G45
   CONFIG_AT91SAM9M10G45
   CONFIG_AT91SAM9N12
   CONFIG_AT91SAM9RL
   CONFIG_AT91SAM9X5
   CONFIG_SAM9X60
   CONFIG_SAMA7G5
   CONFIG_SAMA5D2
   CONFIG_SAMA5D3
   CONFIG_SAMA5D4

These options are already select'd as needed, so we're just cleaning up
files here.

Cc: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 00f3104..e99b906 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -176,6 +176,7 @@
 
 config TARGET_SAMA5D27_SOM1_EK
 	bool "SAMA5D27 SOM1 EK board"
+	select SAMA5D2
 	select BOARD_EARLY_INIT_F
 	select BOARD_LATE_INIT
 	select CPU_V7A