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:374c5096b1cc015fc7aeb0d54523b9a3c811b37d)
Merged-In: I0972d4e7755d02e138aeb7e9780adfafd1fbfce0
Change-Id: I0972d4e7755d02e138aeb7e9780adfafd1fbfce0
2 files changed