kernel: backport RTL8211F clkout-disable patch

In Linux v5.14 an extra feature was introduced for the RTL8211F phy,
allowing to disable a clock output from the phy. Part of that patch is to
always (soft) reset the phy upon initialisation.

This phy reset is required to have a working ethernet on the TP-Link
EAP225-Outdoor v3 and EAP225 v4 after a reboot. Otherwise the ethernet
port will only function properly on cold boots.

Tested-by: Andre Klärner <kandre@ak-online.be> # EAP225-Outdoor v3
Tested-by: Sven Hauer <sven.hauer+github@uniku.de> # EAP225 v4
Signed-off-by: Sander Vanheule <sander@svanheule.net>