intel/fs: drop FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GFX7

intel/fs: drop FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GFX7

We can lower FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD into other more
generic sends and drop this internal opcode.

The idea behind this change is to allow bindless surfaces to be used
for UBO pulls and why it's interesting to be able to reuse
setup_surface_descriptors(). But that will come in a later change.

No shader-db changes on TGL & DG2.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20416>