matypes: Drop some unused defines.

matypes: Drop some unused defines.

Most of these haven't been used since the conversion from checked-in
matypes to generation.  By cutting down the generated contents, this
should clarify why the file is generated: we need
architecture-specific offsets to the V4F fields in the asm that uses
it.

v2: Keep matrix offsets to prevent x86 build breakage..

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>