UBI: remove redundant field

Remove redundant ubi->major field - we have it in ubi->cdev.dev
already.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --cc drivers/mtd/ubi/build.c
Simple merge

diff --cc drivers/mtd/ubi/cdev.c
Simple merge

diff --cc drivers/mtd/ubi/kapi.c
Simple merge

diff --cc drivers/mtd/ubi/ubi.h
Simple merge

diff --cc drivers/mtd/ubi/vmt.c
Simple merge