sh: Fix compile error on lowlevel_init file

lowlevel_init of SH was corrected to use the write/readXX macro.
However, there was a problem that was not able to be compiled partially.
This patch corrected this.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/ms7750se/lowlevel_init.S b/board/ms7750se/lowlevel_init.S
index 7108019..5e09a39 100644
--- a/board/ms7750se/lowlevel_init.S
+++ b/board/ms7750se/lowlevel_init.S
@@ -84,7 +84,7 @@
 	write32	MCR_A, MCR_D1
 
 	/* Set SDRAM mode */
-	write8	SDMR3_A, #0
+	write8	SDMR3_A, SDMR3_D
 
 	! Do you need PCMCIA setting?
 	! If so, please add the lines here...
@@ -108,7 +108,7 @@
 	write32	MCR_A, MCR_D2
 
 	/* Set SDRAM mode */
-	write8	SDMR3_A, #0
+	write8	SDMR3_A, SDMR3_D
 
 	rts
 	nop
@@ -146,6 +146,7 @@
 RTCOR_A:	.long	RTCOR
 RTCOR_D:	.long	RTCOR_D_VALUE	/* Set refresh time (about 15us) */
 SDMR3_A:	.long	SDMR3_ADDRESS
+SDMR3_D:	.long	0x00
 MCR_A:		.long	MCR
 MCR_D1:		.long	MCR_D1_VALUE
 MCR_D2:		.long	MCR_D2_VALUE