LU-18687 libcfs: linux-list.h is no longer needed

LU-18687 libcfs: linux-list.h is no longer needed

The linux-list.h header only includes a test for
hlist_add_after(), which is no longer called in the
code. Remove the header.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I34a57ae0d934bccbbc91d55208fe0d57d1eb331a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58986
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>