Remove allowlist from checkstyle.py

The allowlist was introduced with change
I275e3e726228488e657e283a32909ed81baa09cc
The change doesn't give a reason for it and during
the years there have been many CLs to amend the list.

We should run style checks on all files by default
(for example as we do in frameworks/base) and
use denylists instead.

Test: Create a CL with style error in tests/tests/display
   and verify that it's detected in the preupload hooks.
Fixes: 200550845
Change-Id: I4bfaa9789e114c0f23e060925503c22af46853ec
1 file changed