UBUNTU: SAUCE: hio: splitting bio in the entry of .make_request_fn

UBUNTU: SAUCE: hio: splitting bio in the entry of .make_request_fn

BugLink: http://bugs.launchpad.net/bugs/1638700
From v4.3, the incoming bio can be very big[1], and it is
required to split it first in .make_request_fn(), so
we need to do that for hio.c too.

[1] c66a14d07c136cc3(block: simplify bio_add_page())

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>