[MTD] LPDDR added new pfow_base parameter

We need to supply additional parameter to mapping driver and tell
LPDDR drivers where PFOW window is in chip mapping.
It leads to necessity of map_info structure extendoing.

Signed-off-by: Alexey Korolev <akorolev@infradead.org>
Acked-by: Jared Hulbert <jaredeh@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>