isl: drop left-over comment

Fixes: cf9ff082b4 ("isl: Bring back isl_format_layout::bpb")
Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3674>

src/intel/isl/gen_format_layout.py

@@ -171,7 +171,6 @@ class Format(object):
         # pylint: disable=invalid-name
         self.name = line[0].strip()
 
-        # Future division makes this work in python 2.
         self.bpb = int(line[1])
         self.bw = line[2].strip()
         self.bh = line[3].strip()