ARM: mvebu: use input DT defines in Armada 370/XP boards

Instead of harcoding keycodes specifications in the Armada 370/XP
boards, use the <dt-bindings/input/input.h> header file and its
keycode definitions.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --cc arch/arm/boot/dts/armada-370-rd.dts
Simple merge

diff --cc arch/arm/boot/dts/armada-xp-axpwifiap.dts
Simple merge

diff --cc arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts
Simple merge