[][MAC80211][mt76][update path for mt7996 fw]

[Description]
Change path for mt7996 fw.
Starting from Wi-Fi 7, we'll create a per-chip folder in linux-firmware.
For example:
/lib/firmware/mediatek/mt7996_wm.bin ->
/lib/firmware/mediatek/mt7996/mt7996_wm.bin

[Release-log]
N/A

Change-Id: I459cb0b84681ac9be741fbf44cad1f239c4a162d
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6750486
1 file changed