Add keystore2 permission to get attestation keys

Contexts must have this permission to fetch remotely provisioned
attestation key blobs. It is expected that only credstore will have
this permission.

Test: manual, build and run cuttlefish
Bug: 194696876
Change-Id: Ieebd552129bc8be6b8831ec2e38eb6bda522b216
diff --git a/private/access_vectors b/private/access_vectors
index fc17c1d..0f8dd5f 100644
--- a/private/access_vectors
+++ b/private/access_vectors
@@ -722,7 +722,9 @@
 	change_user
 	clear_ns
 	clear_uid
+	delete_all_keys
 	early_boot_ended
+	get_attestation_key
 	get_auth_token
 	get_state
 	list
@@ -732,7 +734,6 @@
 	report_off_body
 	reset
 	unlock
-	delete_all_keys
 }
 
 class keystore2_key