LU-18162 osd-ldiskfs: leave osd_device_init() unimplemented

LU-18162 osd-ldiskfs: leave osd_device_init() unimplemented

osd_device_init() is never called when using ldiskfs OSD. If it is
called, procfs will improperly be initialized twice. To avoid this
would require a refactor or leaving osd_device_init() as a stub.
For now, remove all functional (uncalled) code from the function
and return 0.

Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Id5d1c2ad28fe2a659b5c31cc4390cd745bc2b95e
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58787
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>