Add/use watchdog with standard timeout

Almost all uses of the watchdog use the same 500ms timeout, so add a new
method that assumes that.

Test: CtsKeystoreTestCases
Change-Id: Idf7852400a58ba954e4a71e5e2282734a0960072
diff --git a/keystore2/src/apc.rs b/keystore2/src/apc.rs
index 6abe849..bdde5ae 100644
--- a/keystore2/src/apc.rs
+++ b/keystore2/src/apc.rs
@@ -363,11 +363,11 @@
         &self,
         listener: &binder::Strong<dyn IConfirmationCallback>,
     ) -> BinderResult<()> {
-        let _wp = wd::watch_millis("IProtectedConfirmation::cancelPrompt", 500);
+        let _wp = wd::watch("IProtectedConfirmation::cancelPrompt");
         map_or_log_err(self.cancel_prompt(listener), Ok)
     }
     fn isSupported(&self) -> BinderResult<bool> {
-        let _wp = wd::watch_millis("IProtectedConfirmation::isSupported", 500);
+        let _wp = wd::watch("IProtectedConfirmation::isSupported");
         map_or_log_err(Self::is_supported(), Ok)
     }
 }