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/configs/meesc_dataflash_defconfig b/configs/meesc_dataflash_defconfig
index 0e8a545..5858a99 100644
--- a/configs/meesc_dataflash_defconfig
+++ b/configs/meesc_dataflash_defconfig
@@ -14,7 +14,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="at91sam9263ek"
 CONFIG_SYS_LOAD_ADDR=0x20100000
 CONFIG_FIT=y
-CONFIG_SYS_EXTRA_OPTIONS="AT91SAM9263,SYS_USE_DATAFLASH"
+CONFIG_SYS_EXTRA_OPTIONS="SYS_USE_DATAFLASH"
 CONFIG_BOOTDELAY=3
 CONFIG_USE_PREBOOT=y
 CONFIG_BOARD_EARLY_INIT_F=y