Merge tag 'renesas-rcar-sysc2-for-v4.7' into arm64-dt-pm-domain-for-v4.7

Second Round of Renesas ARM Based SoC R-Car SYSC Updates for v4.7

Introduce a DT-based driver for the R-Car System Controller, as found on
Renesas R-Car H1, R-Car Gen2, and R-Car Gen3 SoCs.