This adds support for key version 5 which is an EC key using the NIST P-256 curve parameters. OTAs may be signed with these keys using the ECDSA signature algorithm with SHA-256. Change-Id: Id88672a3deb70681c78d5ea0d739e10f839e4567
(cherry picked from commit bac7fba027) Change-Id: I01c38d7fea088622a8b0bbf2c833fa2d969417af
bac7fba027
Change-Id: I9849c69777d513bb12926c8c622d1c12d2da568a