wifi: mt76: mt7915: mcu: re-init MCU before loading FW patch

wifi: mt76: mt7915: mcu: re-init MCU before loading FW patch

Restart the MCU and release the patch semaphore before loading the MCU
patch firmware from the host.

This fixes failures upon error recovery in case the semaphore was
previously taken and never released by the host.

This happens from time to time upon triggering a full-chip error
recovery. Under this circumstance, the hardware restart fails and the
radio is rendered inoperational.

Signed-off-by: David Bauer <mail@david-bauer.net>
Link: https://patch.msgid.link/20250402004528.1036715-3-mail@david-bauer.net
Signed-off-by: Felix Fietkau <nbd@nbd.name>