[][kernel][mt7988][pcie][Add soft off and soft on API]

[Description]
Add soft off and soft on API

[Release-log]
NA


Change-Id: Iab24bf39bca084a7c1e7ab061eb9f842035f7a5f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/9185179
1 file changed