global: Migrate CONFIG_KSNET_SERDES_SGMII2_BASE to CFG

Perform a simple rename of CONFIG_KSNET_SERDES_SGMII2_BASE to CFG_KSNET_SERDES_SGMII2_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 114eb85..90b8821 100644
--- a/drivers/net/ti/keystone_net.c
+++ b/drivers/net/ti/keystone_net.c
@@ -375,7 +375,7 @@
 			CFG_KSNET_SERDES_LANES_PER_SGMII);
 
 #if defined(CONFIG_SOC_K2E) || defined(CONFIG_SOC_K2L)
-	ks2_serdes_init(CONFIG_KSNET_SERDES_SGMII2_BASE,
+	ks2_serdes_init(CFG_KSNET_SERDES_SGMII2_BASE,
 			&ks2_serdes_sgmii_156p25mhz,
 			CFG_KSNET_SERDES_LANES_PER_SGMII);
 #endif