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.

Lustre-change: https://review.whamcloud.com/51480
Lustre-commit: fba78a416621343aadeeb4d28df86e422b653bfe

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Idd8fa747a671079aba2b691ef23cc7564e5e2430
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54618
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>