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
Merge "input: add workaround for broken hardware keyboard support" into lollipop