net: macb: Add PTP support for SAMA5D29

Add PTP capability to the macb config object for sama5d29.

Signed-off-by: Hari Prasath <Hari.PrasathGE@microchip.com>
Link: https://lore.kernel.org/r/20210812074422.13487-1-Hari.PrasathGE@microchip.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>