PM / Domains: R-Mobile SYSC: Document SH-Mobile AG5 (sh73a0) binding

SH-Mobile AG5 (sh73a0) can be handled by the existing bindings.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt

@@ -12,6 +12,7 @@ Required properties:
 	      fallback.
 	      Examples with soctypes are:
 		- "renesas,sysc-r8a7740" (R-Mobile A1)
+		- "renesas,sysc-sh73a0" (SH-Mobile AG5)
 - reg: Two address start and address range blocks for the device:
          - The first block refers to the normally accessible registers,
          - the second block refers to the registers protected by the HPB