tile: support PTP using the tilegx mPIPE (IEEE 1588)

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc arch/tile/gxio/iorpc_mpipe.c
Simple merge

diff --cc arch/tile/include/gxio/iorpc_mpipe.h
Simple merge

diff --cc arch/tile/include/gxio/mpipe.h
Simple merge

diff --cc drivers/net/ethernet/tile/Kconfig
Simple merge

diff --cc drivers/net/ethernet/tile/tilegx.c
Simple merge