kernel: 4.19: kmod-ptp-gianfar follow upstream changes

This patch deprecates the kmod-ptp-gianfar package and
introduces kmod-ptp-qoriq for 4.19+ in its place. This
has become necessary due to the linux kernel commit
ceefc71d4c05 ("ptp: rework gianfar_ptp as QorIQ common PTP driver")

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [reworded commit]