dt-bindings: clk: qcom: Add support for GPU GX GDSCR

In the cases where the GPU SW requires to use the GX GDSCR add
support for the same.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/1581307266-26989-1-git-send-email-tdas@codeaurora.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>