global: Migrate CONFIG_KSNET_SERDES_SGMII_BASE to CFG

Perform a simple rename of CONFIG_KSNET_SERDES_SGMII_BASE to CFG_KSNET_SERDES_SGMII_BASE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/net/ti/keystone_net.c b/drivers/net/ti/keystone_net.c
index 90b8821..89b04b6 100644
--- a/drivers/net/ti/keystone_net.c
+++ b/drivers/net/ti/keystone_net.c
@@ -370,7 +370,7 @@
 #ifndef CONFIG_SOC_K2G
 static void keystone2_net_serdes_setup(void)
 {
-	ks2_serdes_init(CONFIG_KSNET_SERDES_SGMII_BASE,
+	ks2_serdes_init(CFG_KSNET_SERDES_SGMII_BASE,
 			&ks2_serdes_sgmii_156p25mhz,
 			CFG_KSNET_SERDES_LANES_PER_SGMII);