Add mt7915_reset() and refactor mt7915_mac_reset_work() to support
full system recovery.
Co-developed-by: NRyder Lee <ryder.lee@mediatek.com>
Signed-off-by: NRyder Lee <ryder.lee@mediatek.com>
Signed-off-by: NBo Jiao <bo.jiao@mediatek.com>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>