fastcharge: initial Nexus 5 adaptation

added custom charge levels for better control over fastcharge

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: Jean Francis Dominique S. Mabalot <jfdsmabalot@redhat.com>
Merge branch 'mainstream' of https://github.com/emceethemouth/kernel_hammerhead into mainstream

Signed-off-by: Jean Francis Dominique S. Mabalot <jfdsmabalot@redhat.com>