linux-yocto/5.14: bsp/qemuarm*-gfx: use virtio graphics

Integrating the following configuration change:

  Author: Jon Mason <jdmason@kudzu.us>
  Date:   Thu Sep 16 18:22:33 2021 -0400

      bsp/qemuarm*-gfx: use virtio graphics

      Remove Bochs and start using virtio graphics

Signed-off-by: Jon Mason <jdmason@kudzu.us>

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>