HBL: kernel 5.15: LEDs on Turris Omnia not supported

After upgrade of the kernel from version 5.4.203-1-da0ddeb89bb0e25d2a575f62263f6300 to version 5.15.50-1-bbde583666f0d21706f8da40fd4a8532, LEDs stopped working on Omnia. It seems that the driver is missing:

# ls /sys/class/leds/
ath10k-phy0  ath9k-phy1   mmc0::
# rainbow all enable 
Failed to open file: No such file or directory

Reverting to previous kernel fixes the issue.