ptp: ocp: Add firmware header checks

Right now it's possible to flash any kind of binary via devlink and
break the card easily. This diff adds an optional header check when
installing the firmware.

Signed-off-by: Vadim Fedorenko <vadfed@fb.com>
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>