Move device to a separate build target

sdl_host/BUILD

@@ -1,5 +1,5 @@
 cc_binary(
     name = "sdl_host",
     srcs = glob(["*.c", "*.h"]),
-    deps = ["//game:game", "//sdl:sdl"],
+    deps = ["//device:device", "//game:game", "//sdl:sdl"],
 )