ARM: nomadik: select MFD_SYSCON

Since the Power Management Unit is using syscon to access a
set of necessary hardware muxing, let's select MFD_SYSCON for
the Nomadik subarchitecture.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-nomadik/Kconfig

@@ -7,6 +7,7 @@ menuconfig ARCH_NOMADIK
 	select CLKSRC_NOMADIK_MTU_SCHED_CLOCK
 	select CPU_ARM926T
 	select GPIOLIB
+	select MFD_SYSCON
 	select MIGHT_HAVE_CACHE_L2X0
 	select PINCTRL
 	select PINCTRL_NOMADIK