tests: drivers: build_all: virtio: Add VIRTIO Network device

Add the VIRTIO Network device to the driver build_all test on
qemu_x86_64 (PCI) and qemu_cortex_a53 (MMIO). Additionally,
restrict the test to these two platforms, getting rid of qemu_x86,
as enabling networking would cause build errors on many boards,
including the qemu_x86. Use dashes in node names.

Signed-off-by: Jakub Klimczak <jklimczak@internships.antmicro.com>