ARM: pxa: mioa701 add camera output enable gpio

The Micron MT9M111 camera chip needs its output enable to be
activated in order to work. The bootloader is not required to
activate it, so do it in machine code.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>