This is an adoption of the U-Boot commits

| commit fc214ef
| Author: Stefan Brüns <stefan.bruens@rwth-aachen.de>
| Date:   Sat Sep 17 02:10:07 2016 +0200
|
|     ext4: determine group descriptor size for 64bit feature
|
|     If EXT4_FEATURE_INCOMPAT_64BIT is set, the descriptor can be read from
|     the superblocks, otherwise it defaults to 32.
|
|     Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

| commit 3cc5bbb
| Author: Stefan Brüns <stefan.bruens@rwth-aachen.de>
| Date:   Tue Dec 27 02:35:08 2016 +0100
|
|     fs/ext4: Initialize group descriptor size for revision level 0 filesystems
|
|     genext2fs creates revision level 0 filesystems, which are not readable
|     by u-boot due to the initialized group descriptor size field.
|     f798b1d
|
|     Reported-by: Kever Yang <kever.yang@rock-chips.com>
|     Reported-by: FrostyBytes@protonmail.com
|     Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
|     Tested-by: Kever Yang <kever.yang@rock-chips.com>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>