[ARM] generic: sun4i: Restructure DTS files.

Restructing DTS files to have multiple sun4i boards.

Signed-off-by: Pranavkumar Sawargaonkar <pranav.sawargaonkar@gmail.com>
[DRIVERS] net: phy: Fixing usage of of_get_property() in of_mdio.c

Unlike linux our of_get_property() function returns native endian value
hence there is no need to call be32_to_cpup() after of_get_property()
to convert value from Big-Endian to native one.
This patch fixes above usage in of_mdio.c file.

This patch also adds comment about above mentioned difference in
of_get_property() function.

Signed-off-by: Pranavkumar Sawargaonkar <pranav.sawargaonkar@gmail.com>