gpio: sunxi: Add interrupt (eint) definitions for A10s SoC

Interrupt definitions are taken from the A10s datasheet. Tested on
A10s-OLinuXino-MICRO.

Signed-off-by: Tomas Novotny <novotny@rehivetech.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>