LU-13680 osd-ldiskfs: handle large allocations

LU-13680 osd-ldiskfs: handle large allocations

Use OBD_ALLOC_PAGE_ARRAY_LARGE() for oti_dio_pages, as this allocation
can be as large as 512KB due to large PTLRPC_MAX_BRW_PAGES.

Test-Parameters: trivial
Fixes: 72372486a5e9 ("LU-11347 osd: do not use pagecache for I/O")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I0a0557e42bb5db5612c78e6d9b87f366a23ebbe5
Reviewed-on: https://review.whamcloud.com/38943
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>