arm64: Enable PINCTRL for ARCH_BRCMSTB

ARCH_BRCMSTB needs to use the BCM2835 pin controller for chips like
BCM7211 which adopted that pin controller for GPIO.
Signed-off-by: Doug Berger <opendmb@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm64/Kconfig.platforms

@@ -69,6 +69,7 @@ config ARCH_BRCMSTB
 	select BCM7038_L1_IRQ
 	select BRCMSTB_L2_IRQ
 	select GENERIC_IRQ_CHIP
+	select PINCTRL
 	help
 	  This enables support for Broadcom's ARMv8 Set Top Box SoCs