LU-11148 ldlm: enable trybits for PDO lock

LU-11148 ldlm: enable trybits for PDO lock

When trybits was added (in LU-9148), it doesn't enable trybits for
PDO lock in mdt_object_local_lock(), which may cause deadlock in
try_lock.

Signed-off-by: Lai Siyao <lai.siyao@intel.com>
Change-Id: Icfca639cfbd84e1a3bc25d91de0460d2951c2c2b
Reviewed-on: https://review.whamcloud.com/32820
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>