LU-18966 o2iblnd: Missing spin lock in poolset destroy

LU-18966 o2iblnd: Missing spin lock in poolset destroy

Put a spin lock around pool set destroy in
kiblnd_fini_fmr_poolset() and kiblnd_fini_poolset()

Test-Parameters: trivial testlist=sanity-lnet
Signed-off-by: Frank Sehr <fsehr@whamcloud.com>
Change-Id: I4a2864a64b1c1389cab84b120f889b1414a5d0de
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/59059
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>