kernel: Fix boot of realtek rtl838x

kernel: Fix boot of realtek rtl838x

Revert two patches from upstream Linux:
https://github.com/gregkh/linux/commit/135178e90aa43ad949534e1d6e376c4034942caa
https://github.com/gregkh/linux/commit/63a93d1cd6077d79735f804f5a4957bfb240280c

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: John Audia <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/21126
Signed-off-by: Hauke Mehrtens <[email protected]>
(cherry picked from commit 0bfc66e7b50ef5d0653bc209a7d29ab8e3a7c6b2)