Added configurable disk spindown. The disk will also now not spin down while you are running around in the dir browser or pressing buttons in the wps.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1987 a1c6a512-1295-4272-9138-f99709370657

uisimulator/common/stubs.c

@@ -89,6 +89,15 @@ void ata_flush(void)
 {
 }
 
+void ata_spin(void)
+{
+}
+
+void ata_spindown(int s)
+{
+    (void)s;
+}
+
 Menu simulate_usb(void)
 {
     usb_display_info();