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/arch/arm/Kconfig b/arch/arm/Kconfig
index d2dbb1a..d8b63e9 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -689,6 +689,7 @@
 
 config ARCH_UNIPHIER
 	bool "Socionext UniPhier SoCs"
+	select CLK_UNIPHIER
 	select CPU_V7
 	select SUPPORT_SPL
 	select SPL