spi: renesas,sh-msiof: Miscellaneous improvements

Make "clocks" and "power-domains" required everywhere.
Make "resets" required on R-Car Gen2 and newer (i.e. all but SH-Mobile).

Update the example to match reality:
  - Use interrupt binding definitions instead of hardcoded numbers,
  - Convert to new-style CPG/MSSR bindings,
  - Add missing "power-domains" and "resets" properties.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/052af97ecbaa9ba6e0d406883dd3389fa397579a.1678891999.git.geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>