LU-8191 ptlrpc: add missing headers

LU-8191 ptlrpc: add missing headers

Missing headers for several c-files in ptlrpc
cause functions to be incorrectly marked as only
being used within their respective c-files. This
patch adds those missing headers. It also addresses
a couple minor style issues.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Idd8fa747a671079aba2b691ef23cc7564e5e2430
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51480
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@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>