Remove obsolete suppressions of the AndroidJdkLibsChecker Error Prone check

This are obsolete and can be removed.

PiperOrigin-RevId: 822239499

Author: cushon

services/events/java/androidx/test/services/events/TimeStamp.java

@@ -44,7 +44,6 @@ public final class TimeStamp implements Parcelable {
   @NonNull public final Integer nanos;
 
   /** Clock, package-private for testing. */
-  @SuppressWarnings("AndroidJdkLibsChecker")
   static Clock clock = null;
 
   /** Constructor to create a {@link TimeStamp}. */
@@ -89,7 +88,6 @@ public TimeStamp[] newArray(int size) {
       };
 
   @TargetApi(Build.VERSION_CODES.O)
-  @SuppressWarnings("AndroidJdkLibsChecker")
   private static TimeStamp modernNow() {
     if (clock == null) {
       clock = Clock.systemUTC();