LU-16518 mgc: remove mne_swab from mgc_process_nodemap_log()

LU-16518 mgc: remove mne_swab from mgc_process_nodemap_log()

mne_swab is no longer used and can be removed.

Fixes: 41610e6207ef ("LU-8837 mgc: move server-only code out of mgc_request.c")
Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I86f966ba03fcfcec7d91952cc126c1a008c5e26f
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58350
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>