Ext4 support is built in kirkwood kernel.
This patch moves ext4 support to modules and enables it for devices
with SATA interface.
Reviewed-by: Sungbo Eo <mans0n@gorani.run>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
[rebase]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>