mac80211: add back lost debugfs files

Somehow these files were never present or lost, but the code
is there and they seem somewhat useful, so add them back.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

path: root/include/uapi/mtd/Kbuild

# UAPI Header export list
header-y += inftl-user.h
header-y += mtd-abi.h
header-y += mtd-user.h
header-y += nftl-user.h
header-y += ubi-user.h