sunxi: Add i2c 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 sunxi_i2c.c file by:

Stefan Roese <sr@denx.de>

Signed-off-by: Henrik Nordstrom <henrik@henriknordstrom.net>
Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sunxi: Add axp209 pmic 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 sunxi_i2c.c file by:

Stefan Roese <sr@denx.de>

Signed-off-by: Henrik Nordstrom <henrik@henriknordstrom.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>