Support Steam Deck controls directly through hidraw

This reads Steam Deck controls bypassing Steam Input. This allows for access to
motion controls as well as independent access to thumb sticks, trackpads, and
back grip buttons.

Source/Core/InputCommon/ControllerInterface/ControllerInterface.h

@@ -34,6 +34,9 @@
 #if defined(HAVE_SDL2)
 #define CIFACE_USE_SDL
 #endif
+#if defined(HAVE_HIDAPI)
+#define CIFACE_USE_STEAMDECK
+#endif
 
 namespace ciface
 {