sunxi: Add sun4i support

Based linux-sunxi#sunxi commit d854c4de2f57 "arm: Handle .gnu.hash section in
ldscripts" vs v2014.01.

As well as the following signed-off-by the sunxi branch shows commits to
the new sun4i dram bits by:

Berg Xing <bergxing@allwinnertech.com>
Tom Cubie <tangliang@allwinnertech.com>

Signed-off-by: Henrik Nordstrom <henrik@henriknordstrom.net>
Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>