ARM: berlin: add the LIBGPIO as a dependency for the BG2Q

The BG2Q has GPIOs driven by the dwapb GPIO driver. Add the LIBGPIO as a
dependency to be able to support them.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Reviewed-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
diff --git a/arch/arm/mach-berlin/Kconfig b/arch/arm/mach-berlin/Kconfig
index 9266ae3..95c098f 100644
--- a/arch/arm/mach-berlin/Kconfig
+++ b/arch/arm/mach-berlin/Kconfig
@@ -1,5 +1,6 @@
 config ARCH_BERLIN
 	bool "Marvell Berlin SoCs" if ARCH_MULTI_V7
+	select ARCH_REQUIRE_GPIOLIB
 	select ARM_GIC
 	select GENERIC_IRQ_CHIP
 	select DW_APB_ICTL