kernel: Fix boot of realtek rtl838x

kernel: Fix boot of realtek rtl838x

Revert two patches from upstream Linux:
https://github.com/gregkh/linux/commit/135713cd0751bf296e515f5fdec234320f73bbd8
https://github.com/gregkh/linux/commit/231ac951fabae2aaed8b2c00b4a097107be49c8c

This fixes a boot hang on realtek rtl838x switches.
This is the last printed message:
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear)

Thread on mips mailing list:
https://lore.kernel.org/linux-mips/b35fe4b3-8f42-49f4-a6bf-9f0e56d4050c@hauke-m.de/T/#u

Link: https://github.com/openwrt/openwrt/pull/21166
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>