ARM: dts: renesas: Fix SMSC Ethernet compatible values

According to schematics, and confirmed by ID_REV register contents, the
Ethernet controllers on various development board are not SMSC LAN9220,
but different variants:
  - KZM-A9-Dual and KZM-A9-GT: LAN9221,
  - Bock-W and Marzen: LAN89218AQ.

Update the compatible values accordingly.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/59c142176f795b3541c935df43ab11cecd77cc61.1631173813.git.geert+renesas@glider.be