clk: qcom: gcc-apq8084: add GCC_MMSS_GPLL0_CLK_SRC

Add the GCC_MMSS_GPLL0_CLK_SRC, the branch clock gating gpll0 clock for
the multimedia subsystem.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230111060402.1168726-8-dmitry.baryshkov@linaro.org