aiaiai: remove checkpatch.pl from repository

aiaiai: remove checkpatch.pl from repository

This patch removes the file tracked in this repository, since we now use the
in-kernel checkpatch version, or a user specified location. This enables
better control of what checkpatch.pl is used for those who care, without
having to manually update the file in git every time there is a change
upstream.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>