ARM: sunxi: Add Machine support for A33

Add machine support for the Allwinner A33 quad core cortex-a7 based SoC,
which is similar to the A23 SoC.

Signed-off-by: Vishnu Patekar <vishnupatekar0510@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Tested-by: Chen-Yu Tsai <wens@csie.org>