dt-bindings: remoteproc: qcom,sc8280xp-pas: Fix CDSP power desc

The power requirements for the CDSP instances on SC8280XP aren't fully
described, with only one of the three present. Fix that.

Fixes: ee651cd1e944 ("dt-bindings: remoteproc: qcom: pas: Add sc8280xp adsp and nsp pair")
Signed-off-by: Konrad Dybcio <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

Documentation/devicetree/bindings/remoteproc/qcom,sc8280xp-pas.yaml

···
         power-domains:
           items:
             - description: NSP power domain
+            - description: CX power domain
+            - description: MXC power domain
         power-domain-names:
           items:
             - const: nsp
+            - const: cx
+            - const: mxc
 
 unevaluatedProperties: false