[AMDGPU][True16][MC] true16 for v_minmax/maxmin_f16 (#119586)
Support true16 format for v_minmax/maxmin_f16 in MC.
Since we are replacing `v_minmax/maxmin_f16` to `v_minmax/maxmin_f16_t16
/ v_minmax/maxmin_f16_fake16` in Post-GFX11, have to update the CodeGen
pattern for `v_minmax/maxmin_f16` to get CodeGen test passing.