[MTD] LPDDR Command set driver

Driver which handles device command operation.
Details on device operations are available here:
http://www.numonyx.com/Documents/Datasheets/DS-315768_Velocity-Discrete.pdfSigned-off-by: NAlexey Korolev <akorolev@infradead.org>
Acked-by: NJared Hulbert <jaredeh@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>