LU-16796 ldlm: Change struct ldlm_resource to use refcount_t

LU-16796 ldlm: Change struct ldlm_resource to use refcount_t

This patch changes struct ldlm_resource and
struct nrs_tbf_client to use refcount_t instead of atomic_t

This patch also only changes spaces to tabs which were close
to lines of code being changed.

Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ic15f27bc6281725f00bddc465668f81291aad6ec
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53416
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>