[][MT7988][Update mtk_factor_rw.sh]

[Description]
Add MT7988 case to the mtk_factory_rw.sh.

0x000000180000-0x000000380000 : "Factory"
=> The MAC address are located at 0x27FFF4~0x27FFFF.

[Release-log]
N/A

Change-Id: I69c1f06fbf0268021b3b17332555f942148de623
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6316994
1 file changed