clk: uniphier: add Media I/O clock driver for UniPhier SoCs

This is the initial commit for the UniPhier clock drivers.
Currently, only the Media I/O clock is supported.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 9fcde39..a98b74b 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -20,4 +20,6 @@
 	  setting up clocks within SPL, and allows the same drivers to be
 	  used as U-Boot proper.
 
+source "drivers/clk/uniphier/Kconfig"
+
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