LU-13814 osc: add osc_dio_submit

LU-13814 osc: add osc_dio_submit

This function is a coyp of osc_io_submit, specialized to
handle only dio pages.  Converting this to handle batch
submission will come later.

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: Icb6923d22502bbb72af7e8b24b4c9afaba49380b
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52136
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Marc Vef <mvef@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>