dt-bindings: timer: mediatek: Add compatible for MT6795 GP Timer

dt-bindings: timer: mediatek: Add compatible for MT6795 GP Timer

Add a compatible for the General Purpose Timer (GPT) found on the
MediaTek Helio X10 MT6795 SoC which is fully compatible with the
one found in MT6577.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>