clk: qcom: Drop mmcx gdsc supply for dispcc and videocc

Both dispcc and videocc use mmcx power domain now.
Lets drop the supply mmcx from every gdsc.

Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Fixes: 266e5cf3 ("arm64: dts: qcom: sm8250: remove mmcx regulator")
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220713143200.3686765-1-abel.vesa@linaro.org