global: Migrate CONFIG_SH_ETHER_CACHE_WRITEBACK to CFG

Perform a simple rename of CONFIG_SH_ETHER_CACHE_WRITEBACK to CFG_SH_ETHER_CACHE_WRITEBACK

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/gose.h b/include/configs/gose.h
index e54f4b2..45a5373 100644
--- a/include/configs/gose.h
+++ b/include/configs/gose.h
@@ -23,7 +23,7 @@
 #define CONFIG_SH_ETHER_USE_PORT	0
 #define CONFIG_SH_ETHER_PHY_ADDR	0x1
 #define CONFIG_SH_ETHER_PHY_MODE PHY_INTERFACE_MODE_RMII
-#define CONFIG_SH_ETHER_CACHE_WRITEBACK
+#define CFG_SH_ETHER_CACHE_WRITEBACK
 #define CFG_SH_ETHER_CACHE_INVALIDATE
 #define CFG_SH_ETHER_ALIGNE_SIZE	64