ARM: atmel: add at91sam9g20ek_2mmc nand boot support

Add at91sam9g20_2mmc nand boot support. on this board, there is no
dataflash, so disable it

change one commet for at91sam9g20ek board

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/board/atmel/at91sam9260ek/at91sam9260ek.c b/board/atmel/at91sam9260ek/at91sam9260ek.c
index 2555672..3aa394a 100644
--- a/board/atmel/at91sam9260ek/at91sam9260ek.c
+++ b/board/atmel/at91sam9260ek/at91sam9260ek.c
@@ -157,13 +157,18 @@
 
 int board_init(void)
 {
+#ifdef CONFIG_AT91SAM9G20EK_2MMC
+	/* arch number of AT91SAM9G20EK_2MMC-Board */
+	gd->bd->bi_arch_number = MACH_TYPE_AT91SAM9G20EK_2MMC;
+#else
 #ifdef CONFIG_AT91SAM9G20EK
-	/* arch number of AT91SAM9260EK-Board */
+	/* arch number of AT91SAM9G20EK-Board */
 	gd->bd->bi_arch_number = MACH_TYPE_AT91SAM9G20EK;
 #else
 	/* arch number of AT91SAM9260EK-Board */
 	gd->bd->bi_arch_number = MACH_TYPE_AT91SAM9260EK;
 #endif
+#endif
 	/* adress of boot parameters */
 	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;