dt-bindings: clock: qcom: Add missing power-domains property

dt-bindings: clock: qcom: Add missing power-domains property

In order for the GCC votes on the GDSCs it provides to be propagated
to CX, CX needs to be declared as power domain of the GCC.

Document the missing power-domains property to that purpose.

Fixes: 95ba6820a665 ("dt-bindings: clock: qcom: document the Milos Global Clock Controller")
Signed-off-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260327-dt-fix-milos-eliza-gcc-power-domains-v1-1-f14a22c73fe9@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>