intel/fs: Don't use NoDDClk/NoDDClr for split SHUFFLEs

When I copied and pasted the code from MOV_INDIRECT for handling the dependency controls, I missed a subtle difference between MOV_INDIRECT and SHUFFLE. Specifically, MOV_INDIRECT gets lowered to a narrow instruction on Gen7 by the SIMD width lowering whereas SHUFFLE has to split it in the generator. Therefore, the check safety check for whether or not we can use dependency control has to be based on the lowered width rather than the width of the original instruction.

Fixes: a8ac61b0 "intel/fs: NoMask initialize the address..."