phy: marvell: phy-mvebu-a3700-comphy: Remove unsupported modes

Armada 3700 does not support RXAUI, XFI and neither SFI. Remove unused
macros for these unsupported modes.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 9695375a ("phy: add A3700 COMPHY support")
Signed-off-by: David S. Miller <davem@davemloft.net>