soc: keystone: Merge into ti specific directory

Merge drivers/soc/keystone/ into drivers/soc/ti/
and convert CONFIG_TI_KEYSTONE_SERDES into Kconfig.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig
index 8c0f3c0..e4f8834 100644
--- a/drivers/soc/ti/Kconfig
+++ b/drivers/soc/ti/Kconfig
@@ -16,5 +16,11 @@
 	  and a consumer. There is one RINGACC module per NAVSS on TI AM65x SoCs
 	  If unsure, say N.
 
+config TI_KEYSTONE_SERDES
+	bool "Keystone SerDes driver for ethernet"
+	depends on ARCH_KEYSTONE
+	help
+	 SerDes driver for Keystone SoC used for ethernet support on TI
+	 K2 platforms.
 
 endif # SOC_TI