ANDROID: block: Add support for filesystem requests and small segments

Add support in the bio splitting code and also in the bio submission code
for bios with segments smaller than the page size.

Bug: 308663717
Bug: 319125789
Change-Id: Iea511675ad96b0c8255c2b87811ad33c3a02c8fa
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
[jyescas@google.com: the function bio_may_exceed_limits() does not
                     exists in the 5.15 kernel, so the sub page limit
                     code in block/blk.h was moved to the function
                     __blk_queue_split() in block/blk-merge.c]
Signed-off-by: Juan Yescas <jyescas@google.com>