macvlan: pass get_ts_info and SIOC[SG]HWTSTAMP ioctl to real device

Similiar to commit a6111d3c ("vlan: Pass SIOC[SG]HWTSTAMP ioctls to
real device") and commit 37dd9255

 ("vlan: Pass ethtool get_ts_info
queries to real device."), add MACVlan HW ptp support.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>