LU-14042 llite: don't check layout info for page discard

LU-14042 llite: don't check layout info for page discard

The CIT_MISC+ignore_layout is indicating locks/pages manipulation
from the OSC layer, it does not care/access lov layout related info.

Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: Ibdf22f0d47712d370385af4c6c984052b91fc7c6
Reviewed-on: https://review.whamcloud.com/40267
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Yingjin Qian <qian@ddn.com>