ac/nir: use nir_intrinsic_load_hs_out_patch_data_offset_amd in tess lower

ac/nir: use nir_intrinsic_load_hs_out_patch_data_offset_amd in tess lower

radeonsi load this from SGPR arg, can't use static value because TCS output
and TES input may not match (TCS output is not a key for TES) and
determined in runtime.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16705>