i965: Split surface format code into a new file (brw_surface_formats.c).

i965: Split surface format code into a new file (brw_surface_formats.c).

brw_wm_surface_state.c has gotten rather large and unwieldy.  At this
point, it consists of two separate portions:

1. Surface format code

   This includes the giant table of surface formats and what features
   they support on each generation, as well as the code to translate
   between Mesa formats and hardware formats.

   This is used across all generations.

2. Binding table (SURFACE_STATE) related code.

   This is the code to generate SURFACE_STATE entries for renderbuffers,
   textures, transform feedback buffers, constant buffers, and so on, as
   well as the code to assemble them into binding tables.

   This is only used on Gen4-6; gen7_surface_state.c has Gen7+ code.

Since the two are logically separate, and one is reused on every
generation while the other is not, it makes a lot of sense to split
them out.  It should also make finding code easier.

No code is changed by this patch.  I simply copied the file then deleted
portions of both.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>