FW: Hardware rebinding additions

*add kill app to list of available rebinding options
*make longpress rebinding available for back key

RC part: http://gerrit.aokp.co/#/c/15686/

Change-Id: I3f456eefee5620eb7b052f5e0f98ff56988b2ea8
Signed-off-by: Jonathan Steadman <xxwhitehawk@gmail.com>