Driver for 5.10.x kernels

[mildsunrise]

This copies the 5.4 driver and makes the minimal amount of changes to get it working again.
It doesn't try to backport upstream improvements to the drivers.
Submitting in case it's useful, close it otherwise.

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cherrypick the following Linux commits:

• 36fe62ef58 cfg80211: change internal management frame registration API
• 1eb9112588 mmc: sdio: Fix Cypress SDIO IDs macros in common include file

adapt to the following Linux commits:

• 0d519cbf38 debugfs: remove return value of debugfs_create_devm_seqfile()

[emerld2011]

Dear friend，manythanks for supporting the new kernel! I have encounterred a pro. Have you used the nexmon-kernel 5.10 for CSI collection? I have tried several days and received no packets when using two RPi B4 and one router as AP. I checked everything and found there is no regulation.c in patches/…7_45_206/nexmon/src/, is it the possible reason?

[mzakharocsc]

Dear friend，manythanks for supporting the new kernel! I have encounterred a pro. Have you used the nexmon-kernel 5.10 for CSI collection? I have tried several days and received no packets when using two RPi B4 and one router as AP. I checked everything and found there is no regulation.c in patches/…7_45_206/nexmon/src/, is it the possible reason?

5.10 is supported under latest official nexmon_csi

[A-Specker]

This branch + installing some headers worked https://github.com/RPi-Distro/rpi-source
Many thanks @mildsunrise you are the best!

[mildsunrise]

for anyone landing here, this PR was merged years ago as part of #514. I won't close just in case, but my understanding is that the main branch should be all you need