Add the SDM660 DT compatible and its resource structure in order
to support the Venus IP in SDM630, SDM636, SDM660 and SDA variants.

This SoC features Venus 4.4 (HFI3XX) with only one subcore, used
for both encoding and decoding, and switched on with one main and
one subcore dedicated GDSC.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>