missed in 53670fa1

Removed patches were included in Linux kernel

Several changes were backported to OpenWrt 21.02, that's why we can drop
them from this patch.

This was superseded by patch from OpenWrt [1], which was discussed in
OpenWrt mailing list

[1] https://github.com/openwrt/openwrt/commit/8be6350f6646b37929f40a9a482343f22af2065b
[2] https://lists.infradead.org/pipermail/openwrt-devel/2022-December/039950.html

Hopefully, it fixes issue reported by user on our forum:
https://forum.turris.cz/t/unprovoked-oom-mass-killing/18379/16?u=pepe

Fixes: 44fe7446 ("patches/openwrt: Linux
kernel 5.15: refresh all patches")

And as well add missing Kernel option

This was allowed because in OpenWrt 21.02 branch, there is now included
this commit [1].

[1]
https://github.com/openwrt/openwrt/commit/cbce6c6d9519ab86e11c9752910a4c72dd52cb58
("kernel: split kernel version to dedicated files")

This enables MLGRU for Linux 5.15

Difference in power consumption between ondemand and performance
governors is negligible (at least on our boards) while ondemand has
noticeable lag when starting transmissions. Performance was also default
governor in previously shipped kernel, so let's stick to it.

This patch is required only for the latest Linux backports, but we are
not using it, so we can drop it. Reference:
685634ce ("patches/openwrt: 5.15:
mac80211: downgrade")

This reverts commit 838a2844.

Unfortunately, the latest Linux backports does not work for us as there
are some issues in ath10k and mt76, thus Wi-Fi is not working as we
would like.

Fixes:
build/build_dir/target-arm_cortex-a9+vfpv3-d16_musl_eabi/linux-mvebu_cortexa9/mt76-2022-10-01-72b87836/mt7915/init.c:330:37: error: 'IEEE80211_MAX_AMPDU_BUF' undeclared (first use in this function); did you mean 'IEEE80211_MIN_AMPDU_BUF'?
  hw->max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
                                     ^~~~~~~~~~~~~~~~~~~~~~~
                                     IEEE80211_MIN_AMPDU_BUF

This fixes issue within different GNU Linux distributions:
- Ubuntu and Debian starts with the number(s) and then with alphabet
- OpenSuse does it quite opposite

So, this fixes issue for both GNU Linux distributions