Correcting spkr init

kaleid/kernel/io/spkr.c

@@ -55,7 +55,7 @@ void IoDoBeep(void)
     // Worst possible way of waiting
     // We need actual timers
     ulong ticks = IoGetRtcTicks();
-    while (IoGetRtcTicks() < ticks + 2*1024);
+    while (IoGetRtcTicks() < ticks + 512);
 
     IoQuietSpeaker();