use correct at91rm9200 register name

This fixes a naming bug for at91rm9200 lowlevel init code:
NOR boot flash is on chipselect 0, not chipselect 2.  This
makes code use the register name from chip datasheets.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
diff --git a/include/configs/mp2usb.h b/include/configs/mp2usb.h
index 294221f..2eb4af1 100644
--- a/include/configs/mp2usb.h
+++ b/include/configs/mp2usb.h
@@ -55,7 +55,7 @@
 #define MC_ASR_VAL	0x00000000
 #define MC_AASR_VAL	0x00000000
 #define EBI_CFGR_VAL	0x00000000
-#define SMC2_CSR_VAL	0x00003084 /* 16bit, 2 TDF, 4 WS */
+#define SMC_CSR0_VAL	0x00003084 /* 16bit, 2 TDF, 4 WS */
 
 /* clocks */
 #define PLLAR_VAL	0x20263E04 /* 180 MHz for PCK */