use correct at91rm9200 register name in m501sk board

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: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

board/m501sk/memsetup.S

@@ -52,8 +52,8 @@
 #define MC_AASR_VAL 0x00000000
 #define EBI_CFGR 0xFFFFFF64
 #define EBI_CFGR_VAL 0x00000000
-#define SMC2_CSR 0xFFFFFF70
-#define SMC2_CSR_VAL 0x00003284 /* 16bit, 2 TDF, 4 WS */
+#define SMC_CSR0 0xFFFFFF70
+#define SMC_CSR0_VAL 0x00003284 /* 16bit, 2 TDF, 4 WS */
 
 /* clocks */
 #define PLLAR 0xFFFFFC28
@@ -141,8 +141,8 @@ SMRDATA:
 	.word MC_AASR_VAL
 	.word EBI_CFGR
 	.word EBI_CFGR_VAL
-	.word SMC2_CSR
-	.word SMC2_CSR_VAL
+	.word SMC_CSR0
+	.word SMC_CSR0_VAL
 	.word PLLAR
 	.word PLLAR_VAL
 	.word PLLBR