Add new keystore2 permission get_last_auth_time.

This is checked when getting the time of last successful authentication
from keystore2. The auth_service is the only expected caller.

Bug: 303839446
Test: manual
Change-Id: Idf222e69c0553a7be94206b519a95a4006e69507
diff --git a/private/access_vectors b/private/access_vectors
index adb3a61..32d73dd 100644
--- a/private/access_vectors
+++ b/private/access_vectors
@@ -726,6 +726,7 @@
 	early_boot_ended
 	get_attestation_key
 	get_auth_token
+	get_last_auth_time
 	get_state
 	list
 	lock