intel/nir: Set src_type on TCS quads workaround store_output
What does this MR do and why?
intel/nir: Set src_type on TCS quads workaround store_output
We weren't setting this and now it's validated, causing assert failures.
Fixes: 1632948a7640 ("nir: validate src_type of store_output intrinsics, require bit_size >= 16")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11107