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 e850bd756138c276bbae016781439360a584f2fc.

Revert "ARM: dts: r9a06g032: describe switch"
This reverts commit 4de539eaff8d69020e2ef561dc71ad14ce9999e9.

Revert "ARM: dts: r9a06g032: describe GMAC2"
This reverts commit bf5951b862ed5d59c7db1d76ca2c6d1fbb60af12.

Revert "ARM: dts: r9a06g032: describe MII converter"
This reverts commit 672aff55da048751b3024430649a27d0490bdade.

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>