global: Migrate CONFIG_PHY_ET1011C_TX_CLK_FIX to CFG

Perform a simple rename of CONFIG_PHY_ET1011C_TX_CLK_FIX to CFG_PHY_ET1011C_TX_CLK_FIX

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/net/phy/et1011c.c b/drivers/net/phy/et1011c.c
index c243c5b..7eff5ec 100644
--- a/drivers/net/phy/et1011c.c
+++ b/drivers/net/phy/et1011c.c
@@ -60,7 +60,7 @@
 			  mii_reg |
 			  ET1011C_GMII_INTERFACE |
 			  ET1011C_SYS_CLK_EN |
-#ifdef CONFIG_PHY_ET1011C_TX_CLK_FIX
+#ifdef CFG_PHY_ET1011C_TX_CLK_FIX
 			  ET1011C_TX_CLK_EN |
 #endif
 			  ET1011C_TX_FIFO_DEPTH_16);