net: Only enable QEMU_NET_STACK with CONFIG_NET_SLIP_TAP

If CONFIG_NET_SLIP_TAP is not selected QEMU_NET_STACK will not work
which happen when CONFIG_NET_L2_BT is selected.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
1 file changed