LU-17848 osd: deduplicate osd_fid_init()/fini()/alloc()

LU-17848 osd: deduplicate osd_fid_init()/fini()/alloc()

These functions are identical in the two OSD implementations. This
can be moved to lustre/fid/ and made generic.

These functions are forced to live in fid.ko rather than obdclass.ko
due to module dependency issues.

Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: If97ca5615d9bdfe0fe9886686e9ce3ec2b740f7d
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55110
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Mikhail Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>