The driver is taken from the Linux kernel, with the following changes :
 - all DMA removed
 - all asynchronous handling removed, including the interrupt handler,
   and the asynchronous state handling
 - pxa armada support removed

Most the kernel structure was kept, to ease up future fixes integration
from the kernel driver.

The driver is tested on a pxa3xx system development
board (aka. zylonite), and reading, writing, erasing, and bad block
management were tested.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>