i965: Silence unused parameter warnings in genX_state_upload

i965: Silence unused parameter warnings in genX_state_upload

Reduces my build from 1772 warnings to 1717 warnings by silencing 55
instances of things like

../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c: In function ‘gen4_emit_vertex_buffer_state’:
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c:313:41: warning: unused parameter ‘end_offset’ [-Wunused-parameter]
                                unsigned end_offset,
                                         ^~~~~~~~~~
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c: In function ‘gen4_emit_sampler_state_pointers_xs’:
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c:4689:58: warning: unused parameter ‘brw’ [-Wunused-parameter]
 genX(emit_sampler_state_pointers_xs)(struct brw_context *brw,
                                                          ^~~
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c:4690:62: warning: unused parameter ‘stage_state’ [-Wunused-parameter]
                                      struct brw_stage_state *stage_state)
                                                              ^~~~~~~~~~~
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c: In function ‘gen4_upload_default_color’:
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c:4730:40: warning: unused parameter ‘format’ [-Wunused-parameter]
                            mesa_format format, GLenum base_format,
                                        ^~~~~~
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c: In function ‘translate_wrap_mode’:
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c:4906:41: warning: unused parameter ‘brw’ [-Wunused-parameter]
 translate_wrap_mode(struct brw_context *brw, GLenum wrap, bool using_nearest)
                                         ^~~
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c: In function ‘gen4_update_sampler_state’:
../../SOURCE/master/src/mesa/drivers/dri/i965/genX_state_upload.c:4972:37: warning: unused parameter ‘batch_offset_for_sampler_state’ [-Wunused-parameter]
                            uint32_t batch_offset_for_sampler_state)
                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>