qemu: add PACKAGECONFIG for virglrenderer, usb-redir and spice
* drop "fdt sdl" listed twice in PACKAGECONFIG
* keep all 3 disabled by default
* spice, usbredir recipes will eventually be in meta-networking layer
(you can use jansa/spice branch from meta-openembedded-contrib repository)
* virglrenderer recipe will eventually be in oe-core layer
(you can use jansa/qemu branch from openembedded-core-contrib repository)
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
