i965: Remove four and a half year old TODO comments about samplers.

i965: Remove four and a half year old TODO comments about samplers.

I can't actually understand what these mean, and they seem to
essentially say "we should simplify things", which is a nice goal but
not very specific.

Presumably things got cleaned up at some point.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>