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

This reverts commit 8a2f432f.

It conflicts with the LTS merge revert and will be brought back after
that is properly merged.

Bug: 308663717
Bug: 319125789
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Juan Yescas <jyescas@google.com>
Change-Id: I764adf995cae6b485d4d98e410c78128a88647e0
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>