LU-12904 ldiskfs: Add ldiskfs support for linux 5.4

Linux 5.4 ext4 has some changes from 5.0 this
fixes up the ldiskfs patches to apply against 5.4

Test-Parameters: trivial
Cray-bug-id: LUS-8042
Signed-off-by: Shaun Tancheff <stancheff@cray.com>
Change-Id: I116226ec9297eead4dfd3403be748f732e67f54f
Reviewed-on: https://review.whamcloud.com/36583
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>