dt-bindings: net: micrel: Configure latency values and timestamping check for LAN8814 phy

Supports configuring latency values and also adds
check for phy timestamping feature.

Signed-off-by: Divya <Koppera&lt;Divya.Koppera@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>