macro for binding menu button

this will clean code --

what about adding a macro like this:

   DECL_AUTOCONF_DEVICE("NVIDIA Shield", "android", SHIELD_DEFAULT_BINDS)

to replace all the:

   "input_device = \"NVIDIA Shield\" \n"
   "input_driver = \"android\"                    \n"
   SHIELD_DEFAULT_BINDS,

since the autoconf files will be edited again and again, I think this is important for them to be as simple as possible