Use AuthGraph EcDsa::generate_key am: e9b86efbc4 am: c36390e3b7 am: 640682fc52

Original change: https://android-review.googlesource.com/c/platform/system/secretkeeper/+/2900861

Change-Id: Ib457d25bf60ef6d69adbf94aee7ea2a61f0a69a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>