clk: keystone: Build Keystone clock drivers

Now build the keystone common clock drivers. The build is made
conditional based on COMMON_CLK_KEYSTONE

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index dd37f91..5c51115 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -100,6 +100,13 @@
 	---help---
 	  Sypport for the APM X-Gene SoC reference, PLL, and device clocks.
 
+config COMMON_CLK_KEYSTONE
+	tristate "Clock drivers for Keystone based SOCs"
+	depends on ARCH_KEYSTONE && OF
+	---help---
+          Supports clock drivers for Keystone based SOCs. These SOCs have local
+	  a power sleep control module that gate the clock to the IPs and PLLs.
+
 endmenu
 
 source "drivers/clk/mvebu/Kconfig"