Revert the ARM/dts changes for Renesas RZ/N1

Based on a request from Geert:

Revert "ARM: dts: r9a06g032-rzn1d400-db: add switch description"
This reverts commit 9aab31d6.

Revert "ARM: dts: r9a06g032: describe switch"
This reverts commit cf9695d8.

Revert "ARM: dts: r9a06g032: describe GMAC2"
This reverts commit 3f5261f1.

Revert "ARM: dts: r9a06g032: describe MII converter"
This reverts commit 066c3bd3.

to let these changes flow thru the platform and SoC trees.

Link: https://lore.kernel.org/r/CAMuHMdUvSLFU56gsp1a9isOiP9otdCJ2-BqhbrffcoHuA6JNig@mail.gmail.com/
Link: https://lore.kernel.org/r/20220627173900.3136386-1-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>