LU-10994 osc: remove oap_cli

LU-10994 osc: remove oap_cli

Remove the redundant oap_cli member from struct osc_async_page.

...:(cl_page.c:216:__cl_page_alloc()) slab-alloced 'cl_page': 256 at 000000009ab84b37.

Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: Idd088f0906a10773568495933592ac5e755dc047
Reviewed-on: https://review.whamcloud.com/47403
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>