Merge tag 'gpmc-omap-for-v4.16-immutable' of https://github.com/rogerq/linux into nand/next

Pull changes needed for omap OneNAND changes from Roger Quadros:

  OMAP-GPMC: driver updates for v4.16
  * Error out only if both 'bank-width' and 'gpmc,device-width' DT properties are missing.