input: add workaround for broken hardware keyboard support

* add workaround var for devices with broken kernels

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I98b04c6906a0e7a1ad893b25d0377bf6df97f30c
(cherry picked from commit 1ea810379327d70999f6820a29373e5cd9195e11)