dt-bindings: apmu: Document r8a7745 support

Document APMU and SMP enable method for RZ/G1E (also known as
r8a7745) SoC.
Signed-off-by: NFabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/power/renesas,apmu.txt

@@ -8,6 +8,7 @@ Required properties:
 - compatible: Should be "renesas,<soctype>-apmu", "renesas,apmu" as fallback.
 	      Examples with soctypes are:
 		- "renesas,r8a7743-apmu" (RZ/G1M)
+		- "renesas,r8a7745-apmu" (RZ/G1E)
 		- "renesas,r8a7790-apmu" (R-Car H2)
 		- "renesas,r8a7791-apmu" (R-Car M2-W)
 		- "renesas,r8a7792-apmu" (R-Car V2H)