Merge branch 'renesas/rcar-sysc' into next/dt64

This is needed to work around another failure with "make dtbs":

In file included from ../arch/arm64/boot/dts/renesas/r8a7796-salvator-x.dts:12:0:
arch/arm64/boot/dts/renesas/r8a7796.dtsi:13:44: fatal error: dt-bindings/power/r8a7796-sysc.h: No such file or directory

* renesas/rcar-sysc:
  soc: renesas: rcar-sysc: Add support for R-Car M3-W power areas
  soc: renesas: Add r8a7796 SYSC PM Domain Binding Definitions
  soc: renesas: rcar-sysc: Document r8a7796 support