LS980: add project/msm8974-g2-spr.mk, identical to msm8974mk
LS980: add project/msm8974-g2-spr.mk, identical to msm8974mk

detule/lk-g2-spr,detule/lk-g2-spr,detule/lk-g2-spr,detule/lk-g2-spr,detule/lk-g2-spr