P2020RDB Added support of Vitesse PHYs VSC8641(RGMII) and VSC8221(SGMII)

These PHYs are on P2020RDB platform.

Also revamped Freescale copyright message in drivers/net/tsec.c.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>