ARM: dts: vf610-zii-dev-rev-b: add PHYs for switch2

Switch 2 has an 88e1545 PHY behind it, which is a quad PHY.  Only the
first three PHYs are used, the remaining PHY is unused.  When we wire
up the SFF sockets in a later commit, the omission of this causes the
fourth PHY to be used for port 3.  Specifying the PHYs in DT avoids
the auto-probing of the bus, and discovery of this PHY.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>