[][mac80211][wifi6][mt76][Update MT76 smp.sh and Makefile for Cheetah]

[Description]
Change MT76 smp.sh and Makefile for Cheetah.

[Release-log]
N/A


Change-Id: I5fa7fabec1d467439dd6294d897eaf673f1f649e
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8118209
3 files changed