Keystore 2.0: Make MonotonicRawTime use milliseconds.

Bug: 187921344
Test: atest keystore2_test

Change-Id: Iecb86860078899d126527b0633afddf742e77fbc
diff --git a/keystore2/src/enforcements.rs b/keystore2/src/enforcements.rs
index 8bf2090..29a3f0b 100644
--- a/keystore2/src/enforcements.rs
+++ b/keystore2/src/enforcements.rs
@@ -824,12 +824,12 @@
         } else {
             // Filter the matching auth tokens by age.
             if auth_token_max_age_millis != 0 {
-                let now_in_millis = MonotonicRawTime::now().milli_seconds();
+                let now_in_millis = MonotonicRawTime::now();
                 let result = Self::find_auth_token(|auth_token_entry: &AuthTokenEntry| {
                     let token_valid = now_in_millis
-                        .checked_sub(auth_token_entry.time_received().milli_seconds())
+                        .checked_sub(&auth_token_entry.time_received())
                         .map_or(false, |token_age_in_millis| {
-                            auth_token_max_age_millis > token_age_in_millis
+                            auth_token_max_age_millis > token_age_in_millis.milliseconds()
                         });
                     token_valid && auth_token_entry.satisfies(&sids, auth_type)
                 });