DT: irqchip: renesas-irqc: document R8A7743/5 support

Renesas  RZ/G SoC have the R-Car gen2 compatible IRQC interrupt controllers.
Document RZ/G1[ME] (also known as R8A774[35]) SoC bindings.
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/renesas,irqc.txt

-DT bindings for the R-Mobile/R-Car interrupt controller
+DT bindings for the R-Mobile/R-Car/RZ/G interrupt controller
 
 Required properties:
 
 - compatible: has to be "renesas,irqc-<soctype>", "renesas,irqc" as fallback.
   Examples with soctypes are:
     - "renesas,irqc-r8a73a4" (R-Mobile APE6)
+    - "renesas,irqc-r8a7743" (RZ/G1M)
+    - "renesas,irqc-r8a7745" (RZ/G1E)
     - "renesas,irqc-r8a7790" (R-Car H2)
     - "renesas,irqc-r8a7791" (R-Car M2-W)
     - "renesas,irqc-r8a7792" (R-Car V2H)