LU-18486 build: fl_flags removed in 6.8

LU-18486 build: fl_flags removed in 6.8

Linux commit v6.7-rc4-79-gaf7628d6ec19
  fs: convert error_remove_page to error_remove_folio

Provide an abstraction for fl_flags and c.flc_flags

Make mdt_dom_fiemap a static function.

Test-Parameters: trivial
Fixes: 3177b0dc5d1 ("LU-2525 ldlm: add asynchronous flocks")
Fixes: 5921e1571f2 ("LU-14510 dom: fiemap support for DoM files")
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: Icb659a8ab19c00454391cbb7df31c2bb7f9a85c4
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/57123
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Shuichi Ihara <sihara@ddn.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>