freescale: fman: make sure phy-handle property is big endian

When creating phy-handle property, an unsigned int value is created by
fdt_create_phandle, and memcpy is used to get the value, since DTS is
big endian, the value cannot be used directly on little endian SoCs,
it should be converted by cpu_to_fdt32.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>