Fix 100Mbs ethernet operation on sh7763 based boards

100Mbs ethernet does not work on sh7763 chips due to the wrong value being
used in the GECMR register. Following diff fixes the problem

Signed-off-by: Simon Munton	<simon@nidoran.m5data.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

drivers/net/sh_eth.h

@@ -168,7 +168,7 @@ enum DMAC_T_BIT {
 
 /* GECMR */
 enum GECMR_BIT {
-	GECMR_1000B = 0x01, GECMR_100B = 0x40, GECMR_10B = 0x00,
+	GECMR_1000B = 0x01, GECMR_100B = 0x04, GECMR_10B = 0x00,
 };
 
 /* EDRRR*/