[][Add rxdesc for mt7622 on SDK5x]

[Description]
Add head_rx_descinfo4 for mt7622 on SDK5x

[Release-log]
N/A

Change-Id: I19e31571bb21256b876b11346a21f4b7feb23c90
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4732798
1 file changed