LU-17285 obdclass: remove debug from obd_get_at_*

LU-17285 obdclass: remove debug from obd_get_at_*

Removing debugging CDEBUG() from obd_get_at_*() helpers.
Messages like the following:
00010000:00100000:0.0:1699657756.854481:0:27978:0:
	(ldlm_request.c:181:ldlm_cp_timeout()) NULL obd

Fixes: 0f2bc318d7 ("LU-15246 ptlrpc: per-device adaptive timeout parameters")
Test-Parameters: trivial
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: Iaaa964d4e3ca62de5fb273f865d7cd4c3a4f9a29
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53106
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>