Revert "dt-bindings: clock: renesas,rzg2l-cpg: Update #power-domain-cells = <1> for RZ/G3S"

This reverts commit f33dca9ed6.

Since the configuration order between the individual MSTOP and CLKON
bits cannot be preserved with the power domain abstraction, drop the
power domain IDs.
Currently, there are no device tree users for #power-domain-cell = <1>.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: "Rob Herring (Arm)" <robh@kernel.org>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/20250527112403.1254122-9-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/clock/renesas,rzg2l-cpg.yaml

@@ -57,8 +57,7 @@ properties:
       can be power-managed through Module Standby should refer to the CPG device
       node in their "power-domains" property, as documented by the generic PM
       Domain bindings in Documentation/devicetree/bindings/power/power-domain.yaml.
-      The power domain specifiers defined in <dt-bindings/clock/r9a0*-cpg.h> could
-      be used to reference individual CPG power domains.
+    const: 0
 
   '#reset-cells':
     description:
@@ -77,21 +76,6 @@ required:
 
 additionalProperties: false
 
-allOf:
-  - if:
-      properties:
-        compatible:
-          contains:
-            const: renesas,r9a08g045-cpg
-    then:
-      properties:
-        '#power-domain-cells':
-          const: 1
-    else:
-      properties:
-        '#power-domain-cells':
-          const: 0
-
 examples:
   - |
     cpg: clock-controller@11010000 {