Revert the ARM/dts changes for Renesas RZ/N1

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 12a17d467c7137432049cb6e1e7bcc50fd9c67a1.

Revert "ARM: dts: r9a06g032: describe switch"
This reverts commit 8bec8ab915b27d9014a34b9827b7a22badf95424.

Revert "ARM: dts: r9a06g032: describe GMAC2"
This reverts commit 79fbcb704006473eeefd94bdb87bc7296f68e81f.

Revert "ARM: dts: r9a06g032: describe MII converter"
This reverts commit f933b2dd7252da2355adf3d77a1da6b7948f471b.

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>