dt-bindings: clock: Add QCOM SDM630 and SDM660 graphics clock bindings

Add device tree bindings for graphics clock controller for
Qualcomm Technology Inc's SDM630 and SDM660 SoCs.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Link: https://lore.kernel.org/r/20210113183817.447866-10-angelogioacchino.delregno@somainline.org


Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>