igep00x0: change mpurate from 500 to auto

This patch changes the default mpurate variable from 500 to auto on
all IGEP boards, with this the default rate is autoselected.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>

include/configs/igep00x0.h

@@ -136,7 +136,7 @@
 	"loadaddr=0x82000000\0" \
 	"usbtty=cdc_acm\0" \
 	"console=ttyS2,115200n8\0" \
-	"mpurate=500\0" \
+	"mpurate=auto\0" \
 	"vram=12M\0" \
 	"dvimode=1024x768MR-16@60\0" \
 	"defaultdisplay=dvi\0" \