firmware: qcom: scm: Add gpu_init_regs call

This will used by drm/msm to initialize GPU registers that Qualcomm's
firmware doesn't make writeable to the kernel.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20240430-a750-raytracing-v3-2-7f57c5ac082d@gmail.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>