LU-12355 llite: MS_* flags and SB_* flags split

LU-12355 llite: MS_* flags and SB_* flags split

In kernel 4.20 the MS_* flags should only be used for mount
time flags and SB_* flags for checking super_block.s_flags
The MS_* flags have moved to a uapi header

Linux-commit: e262e32d6bde0f77fb0c95d977482fc872c51996

Test-Parameters: trivial
Change-Id: Ifd64efb16c7795377ece066d01ae04dc004a13ac
Signed-off-by: Shaun Tancheff <stancheff@cray.com>
Reviewed-on: https://review.whamcloud.com/35019
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>