isl: Silence unused parameter warnings in __gen_combine_address implementations

isl: Silence unused parameter warnings in __gen_combine_address implementations

Reduces my build from 1808 warnings to 1772 warnings by silencing 36
instances of things like

../../SOURCE/master/src/intel/isl/isl_emit_depth_stencil.c: In function ‘__gen_combine_address’:
../../SOURCE/master/src/intel/isl/isl_emit_depth_stencil.c:30:29: warning: unused parameter ‘data’ [-Wunused-parameter]
 __gen_combine_address(void *data, void *loc, uint64_t addr, uint32_t delta)
                             ^~~~
../../SOURCE/master/src/intel/isl/isl_emit_depth_stencil.c:30:41: warning: unused parameter ‘loc’ [-Wunused-parameter]
 __gen_combine_address(void *data, void *loc, uint64_t addr, uint32_t delta)
                                         ^~~

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