wifi: mt76: mt7915: trigger L1 SER on PLE MDP RIOC hang

WM firmware can enter a partial failure state where RX is hung.

Detect this condition by monitoring SER_PLE_ERR_1 for MDP_RIOC_HANG_ERR
and trigger L1 SER to restore operation. Use transition detection on the
error bit to fire only once per new occurrence, preventing an infinite
SER loop when the bit remains set across checks.

Signed-off-by: Chad Monroe <chad@monroe.io>
Suggested-by: Ryder Lee <ryder.lee@mediatek.com>
Link: https://patch.msgid.link/20260724124813.3961474-24-nbd@nbd.name
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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