- Fix rejection of legitimate flash subnodes containing multiple
    compatible values,
  - Add missing list of required properties.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/d81b59a513c2a5204c8378b4a89cd07f97c46797.1627401508.git.geert+renesas@glider.beSigned-off-by: NRob Herring <robh@kernel.org>