dm integrity: fix the maximum number of arguments

stable inclusion
from linux-4.19.169
commit dd712c8f5f4f46b1c4682109c5cacbe001459133

--------------------------------

commit 17ffc193 upstream.

Advance the maximum number of arguments from 9 to 15 to account for
all potential feature flags that may be supplied.

Linux 4.19 added "meta_device"
(356d9d52) and "recalculate"
(a3fcf725) flags.

Commit 468dfca3 added
"sectors_per_bit" and "bitmap_flush_interval".

Commit 84597a44 added
"allow_discards".

And the commit d537858a added
"fix_padding".

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>