arm64: dts: qcom: eliza: Add missing CX power domain to GCC

arm64: dts: qcom: eliza: Add missing CX power domain to GCC

Unless CX is declared the power-domain of GCC votes (power and
performance) on the GDSCs provided by GCC will not propagate to the CX,
which might result in under-voltage conditions.

Add the missing power-domains property to associate GCC with RPMHPD_CX.

Fixes: db7fe6963466 ("arm64: dts: qcom: Introduce Eliza Soc base dtsi")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260324-eliza-base-dt-fixes-v3-2-3a4a03e72f8f@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>