Support for P256 curve in RKP for Strongbox

Bug: 219962281
Test: Run Rkp Vts tests.

(cherry picked from https://android-review.googlesource.com/q/commit:fb213d60310fdd7905be85856b25cf7c79084d9f)
Merged-In: Ic38fd2318dd8749ae125f1e78d25f2722bd367e5
Change-Id: Ic38fd2318dd8749ae125f1e78d25f2722bd367e5
5 files changed