Convert CONFIG_AT91SAM9G10EK et al to Kconfig

This converts the following to Kconfig:
   CONFIG_AT91SAM9G10EK
   CONFIG_AT91SAM9261EK
   CONFIG_AT91SAM9G10

Cc: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/at91sam9g10ek_dataflash_cs0_defconfig b/configs/at91sam9g10ek_dataflash_cs0_defconfig
index cee1f9c..a847362 100644
--- a/configs/at91sam9g10ek_dataflash_cs0_defconfig
+++ b/configs/at91sam9g10ek_dataflash_cs0_defconfig
@@ -5,6 +5,7 @@
 CONFIG_SYS_MALLOC_LEN=0x2d000
 CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_TARGET_AT91SAM9261EK=y
+CONFIG_AT91SAM9G10=y
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_SIZE=0x4200
 CONFIG_ENV_OFFSET=0x4200
@@ -16,7 +17,7 @@
 CONFIG_DEBUG_UART_CLOCK=100000000
 CONFIG_DEBUG_UART=y
 CONFIG_SYS_LOAD_ADDR=0x22000000
-CONFIG_SYS_EXTRA_OPTIONS="AT91SAM9G10,SYS_USE_DATAFLASH_CS0"
+CONFIG_SYS_EXTRA_OPTIONS="SYS_USE_DATAFLASH_CS0"
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS0,115200 root=/dev/mtdblock0 mtdparts=atmel_nand:-(root) rw rootfstype=jffs2"