muas3001: update BR4 settings

Also set up the port pins for using I2C.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/include/configs/muas3001.h b/include/configs/muas3001.h
index bc085b8..a13648b 100644
--- a/include/configs/muas3001.h
+++ b/include/configs/muas3001.h
@@ -395,7 +395,7 @@
 #define CFG_IO_SIZE	1
 
 #define CFG_BR4_PRELIM	((CFG_IO_BASE & BRx_BA_MSK) |\
-			 BRx_PS_32 | BRx_MS_GPCM_L | BRx_V)
+			 BRx_PS_16 | BRx_MS_GPCM_L | BRx_V)
 
 #define CFG_OR4_PRELIM	(0xfff80020)