global: Migrate CONFIG_SH_ETHER_USE_PORT to CFG

Perform a simple rename of CONFIG_SH_ETHER_USE_PORT to CFG_SH_ETHER_USE_PORT

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/silk.h b/include/configs/silk.h
index 21100c4..7bed32d 100644
--- a/include/configs/silk.h
+++ b/include/configs/silk.h
@@ -22,7 +22,7 @@
 #define RCAR_GEN2_UBOOT_SDRAM_SIZE	(512 * 1024 * 1024)
 
 /* SH Ether */
-#define CONFIG_SH_ETHER_USE_PORT	0
+#define CFG_SH_ETHER_USE_PORT	0
 #define CFG_SH_ETHER_PHY_ADDR	0x1
 #define CFG_SH_ETHER_PHY_MODE PHY_INTERFACE_MODE_RMII
 #define CFG_SH_ETHER_CACHE_WRITEBACK