intel: Use common helpers for TCS passthrough shaders

intel: Use common helpers for TCS passthrough shaders

Rob added these new helpers a while back, which freedreno and radeonsi
both share.  We should use them too.  The new helpers use variables and
system value intrinsics, so we can drop the explicit binding table
creation and just use the normal paths.

Because we have to rewrite the system value uploading anyway, we drop
the scrambling of the default tessellation levels on upload, and instead
let the compiler go ahead and remap components like any normal shader.
In theory, this results in more shuffling in the shader.  In practice,
we already do MOVs for message setup.  In the passthrough shaders I
looked at, this resulted in no extra instructions on Icelake (SIMD8
SINGLE_PATCH) and Tigerlake (8_PATCH).  On Haswell, one shader grew by
a single instruction for a pittance of cycles in a stage that isn't a
performance bottleneck anyway.  Avoiding remapping wasn't so much of an
optimization as just the way that I originally wrote it.  Not worth it.

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20809>