Use accessor for EVP_PKEY types am: 39b1ba3702 am: c4f9d05b28

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/2148656

Change-Id: I609deda8576a8970b8b64e0638aaeb6c23d4a8d9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>