GCC and it's GDSCs are under the RPMh CX power domain. So let's add the
missing RPMh power domain to the GCC node.

Fixes: 6d4cf750 ("arm64: dts: sdm845: Add minimal dts/dtsi files for sdm845 SoC and MTP")
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Co-developed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20230720054100.9940-4-manivannan.sadhasivam@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>