LU-8191 llite: convert functions to static

LU-8191 llite: convert functions to static

Static analysis shows that a number of functions
could be made static. This patch declares several
functions in llite static.

Also, conserve more * in comments.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Iafa3bb84de158e31b27b7784243bc15e78187f10
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51441
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>