Support to get EC public key from the UdsCertchain.

Bug: 297123463
Bug: 285896470
Test: VtsHalRemotelyProvisionedComponentTargetTest
(cherry picked from https://android-review.googlesource.com/q/commit:a18883a58cc9f6b702095bb17bbd0e4e894be49c)
Merged-In: I7f829b1346feeab0fd429ad7b9714181b6668b34
Change-Id: I7f829b1346feeab0fd429ad7b9714181b6668b34
1 file changed