Drop '#include "ui.h"' from device.h.

We don't need the dependency in the header.

Test: mmma -j bootable/recovery
Change-Id: I03741ae7911a7e8bf1284b2821cf986ca0ab434e
diff --git a/device.cpp b/device.cpp
index f881daf..3b0942c 100644
--- a/device.cpp
+++ b/device.cpp
@@ -16,6 +16,8 @@
 
 #include "device.h"
 
+#include "ui.h"
+
 static const char* MENU_ITEMS[] = {
   "Reboot system now",
   "Reboot to bootloader",