wayland: Remove DRM_FORMAT_MOD_INVALID defines

In both cases we already unconditionally import drm_fourcc.h and all
distros shipping recent Mutter should by now have versions of that file
containing MOD_INVALID.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3065>

src/wayland/meta-wayland-buffer.c

@@ -66,10 +66,6 @@
 #include "backends/native/meta-renderer-native.h"
 #endif
 
-#ifndef DRM_FORMAT_MOD_INVALID
-#define DRM_FORMAT_MOD_INVALID ((1ULL << 56) - 1)
-#endif
-
 enum
 {
   RESOURCE_DESTROYED,