Cherry-pick recent licensing changes

Add LICENSE
Update license and copyright banners

Change-Id: I5cc98246f3a0f6961d2efd281ab1b62757a74bcd
(cherry picked from commit f2f6166267925726f44147d303e4f7307df33df1)
(cherry picked from commit f09ae16ee7307eca6bed2fedc54e4ad621f64ab5)