mt76: mt7663: fix the usage WoW with net detect support

mt7615_mcu_sched_scan_enable should be taken along with
mt7615_mcu_sched_scan_req to have proper scan plans initialization.

Fixes: bd39bd2f00c3 ("mt76: mt7663: introduce WoW with net detect support")
Co-developed-by: Wan-Feng Jiang <Wan-Feng.Jiang@mediatek.com>
Signed-off-by: Wan-Feng Jiang <Wan-Feng.Jiang@mediatek.com>
Co-developed-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>