Use Linux checkpatch.pl to check for style problems on each commit
rather than waste time on mailing lists.
The hooks are installed by default with autogen.sh if there are
no pre-existing hooks, e.g. if a global template is used.
Commits can still be forced by using git commit -n (or --no-verify) if
you absolutely need to bypass checkpatch.pl in a work branch.
Note that both checkpatch.pl and spelling.txt are provided under
a GPL v2 license.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>