omap4: ttyO2 instead of ttyS2 in default bootargs

Set console=ttyO2 instead of ttyS2 in default bootargs
according to latest kernel config

Signed-off-by: Aneesh V <aneesh@ti.com>

include/configs/omap4_common.h

@@ -150,7 +150,7 @@
 
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"loadaddr=0x82000000\0" \
-	"console=ttyS2,115200n8\0" \
+	"console=ttyO2,115200n8\0" \
 	"usbtty=cdc_acm\0" \
 	"vram=16M\0" \
 	"mmcdev=0\0" \