remove the dead-wait before the PDDB is mounted

the "right" way to do this is to poll to see if trusted init is
done. once that is done, you can go ahead and try to mount the
PDDB.

services/shellchat/src/main.rs

@@ -426,7 +426,11 @@ fn wrapped_main() -> ! {
         let main_conn = xous::connect(shch_sid).unwrap();
         move || {
             let tt = ticktimer_server::Ticktimer::new().unwrap();
-            tt.sleep_ms(500).ok(); // give some time for the system to finish booting
+            let xns = xous_names::XousNames::new().unwrap();
+            let gam = gam::Gam::new(&xns).unwrap();
+            while !gam.trusted_init_done().unwrap() {
+                tt.sleep_ms(50).ok();
+            }
             loop {
                 let (no_retry_failure, count) = pddb::Pddb::new().try_mount();
                 pddb_init_done.store(true, Ordering::SeqCst);