LU-9859 libcfs: move cfs_trace_data data to tracefile.c

LU-9859 libcfs: move cfs_trace_data data to tracefile.c

The macro cfs_tcd_for_each() is only used in tracefile.c so move
it from the header tracefile.h along with related material in
the header file.

Test-Parameters: trivial
Change-Id: I024dc0a4a1f5481cf3468c35e670096f29817c23
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Reviewed-on: https://review.whamcloud.com/38914
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>