intel/fs: Remove type-based restriction for cmod propagation to saturated operations

intel/fs: Remove type-based restriction for cmod propagation to saturated operations

Previously, we misunderstood how conditional modifiers and saturate
interacted.  We thought the condition was evaulated before the saturate
was applied.  For the floating point cases, we went to some heroics to
modify the condition to maintain the same results.  For integer cases,
it was not clear that this could even work.  We had no use-cases and no
tests-cases, so we just disallowed everything.

Now we understand that the condition is evaluated after the saturate.
Earlier commits in this series removed the various floating point
heroics.  It is easier to just delete the code that prevents some cases
that just work.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12045>