drivers/slip: Fix circular dependency on NET_SLIP

Fixes this warning:

warning: (NET_SLIP_TUN && NET_SLIP_TAP && NET_SLIP_TUN && NET_SLIP_TAP) selects SLIP which has unmet direct dependencies (NET_SLIP)

Change-Id: Ic51f8403a4de19f90ba4dcdca93877d51dabf787
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
1 file changed