meson: move wayland_drm_protocol generation to wayland-drm
These files are needed by both vulkan wayland-wsi and by egl wayland-wsi, since the XML file is in src/egl/wayland/wayland-drm and we can include this directory in such a way that it will be loaded before egl and vulkan this allows us to avoid multiple calls to the same generator. Signed-off-by:Dylan Baker <dylanx.c.baker@intel.com> Reviewed-and-Tested-by:
Eric Engestrom <eric@engestrom.ch>