arm64: dts: r8a7795: Add SYSC PM domains

Add a device node for the System Controller, with subnodes that
represent the hardware power area hierarchy.
Hook up the Cortex-A57 CPU cores and the Cortex-A57 and Cortex A53 L2
caches/SCUs to their respective PM domains.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
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The SH core was dropped in datasheet rev. 0.5E?

v2:
  - New.
1 file changed