releasetools: update

Change-Id: I0d242931c35804e34cdb16a61d16329ebcc6b7ed
kernel task: bring in from CM

Change-Id: Ibd16d145f5fd62555811f6270757b62362f48c22
superuser: add key files

Change-Id: I6f11817cc0c5ce62f8a8cd6edb3e3da91081727d
update make files

Change-Id: I21f93bd172f4ac1c2f46032c60ab61b687113234