ARM: sunxi: select MFD_SUN6I_PRCM when sun6i arch support is enabled

Select the MFD_SUN6I_PRCM option when sun6i arch is enabled in order to get
the PRCM (Power/Reset/Clock Management) related drivers compiled.
Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/mach-sunxi/Kconfig

@@ -23,6 +23,7 @@ config MACH_SUN6I
 	default ARCH_SUNXI
 	select ARCH_HAS_RESET_CONTROLLER
 	select ARM_GIC
+	select MFD_SUN6I_PRCM
 	select RESET_CONTROLLER
 	select SUN5I_HSTIMER