arm64: berlin: enable ARCH_REQUIRE_GPIOLIB

All berlin SoCs have GPIOs driven by the dwapb GPIO driver. Add GPIOLIB
as a dependency to be able to support them.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>