Reduce priority of "cleared HibernateLocation" message

This message appears when a computer hibernates, then awakens, then reboots,
and everything goes OK.  It's a normal progress message the user doesn't need
to know about, but it distracts them from important startup messages and could
even train them to ignore the warning when the procedure fails.

Reduce the level to LOG_INFO.

src/hibernate-resume/hibernate-resume.c

@@ -120,7 +120,7 @@ static int action_clear(void) {
 
         r = clear_efi_hibernate_location_and_warn();
         if (r > 0)
-                log_notice("Successfully cleared HibernateLocation EFI variable.");
+                log_info("Successfully cleared HibernateLocation EFI variable.");
         return r;
 }