i965: Drop brw_bo_map[_gtt] wrappers which issue perf warnings.

i965: Drop brw_bo_map[_gtt] wrappers which issue perf warnings.

The stupid reason for eliminating these functions is that I'm about
to rename drm_bacon_bo_map() to brw_bo_map(), which makes the real
function have the short name, rather than the wrapper.

I'm also planning on reworking our mapping code soon, so we use WC
mappings and proper unsynchronized mappings on non-LLC platforms.
It will be easier to do that without thinking about the stall
warnings and wrappers.

My eventual hope is to put the performance warnings in the BO map
function itself, so all callers gain the warning.

Acked-by: Jason Ekstrand <jason@jlekstrand.net>