Merge tag 'gpmc-generic-timing' of git://gitorious.org/x0148406-public/linux-kernel...

These changes provide a generic gpmc timing calculation method,
migrates existing peripherals that makes use of custom gpmc timing
calculation method to use the new generic one.

Generic routine has been verified for onenand async timing calculation
on omap3evm (with a local change to add onenand support). Generic
timing calculation method were verified for other peripherals by
simulation. Generic method has to be verified on peripherals supported
in mainline.