PTP requires at least one timer to be 1PPS so describe it.
For testing, load kernel module gianfar_ptp and use ptp4l
from linuxptp.

Copied from FSL P1010RDB reference design.

Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>

SVN-Revision: 48275