slip: Fix debug printing

Print the link layer header in different color so that the
actual IP payload in packets are easier to see. Also the
link layer header of the first packet was not printed.

Change-Id: I99699d378ae28d6d90c683c646c904c926b7dd06
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
1 file changed