littlefs: Update to version 1.3#6179

Merged

cmonr merged 8 commits intoARMmbed:masterfrom

geky:lfs-update

Mar 1, 2018

Commits on Feb 22, 2018

Commits on Feb 27, 2018

littlefs: Adopted new test configurations and status
geky
committed

Commits on Mar 1, 2018

littlefs: Updated error codes in tests to match version update
geky
committed