arm64: uniphier: select ARCH_HAS_RESET_CONTROLLER

The UniPhier reset driver (drivers/reset/reset-uniphier.c) has been
merged.  Select ARCH_HAS_RESET_CONTROLLER from the SoC Kconfig.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm64/Kconfig.platforms

@@ -190,6 +190,7 @@ config ARCH_THUNDER
 
 config ARCH_UNIPHIER
 	bool "Socionext UniPhier SoC Family"
+	select ARCH_HAS_RESET_CONTROLLER
 	select PINCTRL
 	help
 	  This enables support for Socionext UniPhier SoC family.