octeon: ubnt-*: Add device specific DTS pruning
This imports device specific DTS pruning from
https://github.com/UI-Packages/kernel_e200/blob/master/arch/mips/cavium-octeon/octeon-platform.c#L1067
- Reduce MMC clock frequency on E200/E220 to make
MMC communication reliable again. See linked issue.
- Remove unused MMC node on E300.
Link: https://github.com/openwrt/openwrt/issues/13762
Signed-off-by: Jakob Haufe <sur5r@sur5r.net>
Link: https://github.com/openwrt/openwrt/pull/19229
Signed-off-by: Robert Marko <robimarko@gmail.com>