net: keystone_serdes: add keystone K2L SoC support

Keystone2 Lamar SoC uses the same keystone SerDes driver.
All Keystone2 EVM boards currently use SerDes driver, so move
CONFIG_TI_KEYSTONE_SERDES to common configuration file.

Acked-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
diff --git a/include/configs/ks2_evm.h b/include/configs/ks2_evm.h
index b0c91d8..7f44ea4 100644
--- a/include/configs/ks2_evm.h
+++ b/include/configs/ks2_evm.h
@@ -140,6 +140,9 @@
 #define CONFIG_KSNET_SERDES_SGMII2_BASE		KS2_SGMII_SERDES2_BASE
 #define CONFIG_KSNET_SERDES_LANES_PER_SGMII	KS2_LANES_PER_SGMII_SERDES
 
+/* SerDes */
+#define CONFIG_TI_KEYSTONE_SERDES
+
 /* AEMIF */
 #define CONFIG_TI_AEMIF
 #define CONFIG_AEMIF_CNTRL_BASE		KS2_AEMIF_CNTRL_BASE