feat(cert-create): ecdsa p384 key support

Adding ECDSA P384 (secp384r1) key creation support through key_bits
obtained from KEY_SIZE.

Change-Id: I571251caef20222990bd927cdfb5f35bf2a185d0
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
2 files changed