net: phylink: add MAC phy_interface_t bitmap

commit b3ecb1f0373fe25e140f522a30b87a9c3b4cf4a8 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



commit 38c310eb upstream.

Add a phy_interface_t bitmap so the MAC driver can specifiy which PHY
interface modes it supports.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>