i965/fs: Remove unused count from vs urb setup

i965/fs: Remove unused count from vs urb setup

This was originally removed here:
commit 031d3501322aee0a1474c7f2a9b79f9fa9947430
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Tue Aug 25 16:59:12 2015 -0700

    i965/vs: Unify URB entry size/read length calculations between backends.

Then added back:
commit bd198b9f0a292a9ff4ffffec3a29bad23d62caba
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Fri Aug 14 16:01:33 2015 -0700

    i965/vs: Simplify fs_visitor's ATTR file.

Note that the authorship dates are out of order, but the above reflects the
order of the commit dates.

Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>