Commit 424f53ac07 (package/freescale-imx/imx-gpu-viv: drop X11 output)
dropped BR2_PACKAGE_IMX_GPU_VIV_OUTPUT_X11 which xdriver_xf86-video-imx-viv
depends on, so the package is no longer selectable.
So drop the package and add a legacy symbol for it.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
