[][Add and enable mt7981 linux cpu hotplug support]

[Description]
Add and enable mt7981 linux cpu hotplug support

[Release-log]
N/A

Change-Id: I0b44de7dfd19538fd72f4ffdf620e443a7615f4f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5305910
1 file changed