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 Ténart <antoine.tenart@free-electrons.com>
Reviewed-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
ARM: dts: berlin: add GPIO nodes for the BG2Q

The Marvell Berlin BG2Q has 6 GPIO ports compatible with the snps,dw-apb-gpio
driver. This patch adds the corresponding device tree nodes.

Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
Reviewed-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Merge branch 'berlin/soc' into berlin/for-next
Merge branch 'berlin/dt' into berlin/for-next