sr: update to Touch UI Patch Level 8
WIP: backup/restore progress

Change-Id: Id8d7fde4d9bd8b300dc1ee5ea55ac17651019c0f
Fix mount issue.
sr: updater: Use custom bootloader msg offset for stage functions

Edify commands get_stage and set_stage need to be aware of the
custom bootloader msg offset because they write the stage directly
to the BCB.

Change-Id: I155d94ef0a875ddd896c5de0043b8039b9f23194
sr: updater: Fix multi-stage docs and code

* Fix reboot_now comments to reflect actual usage.

* Fix get_stage arg check, it only requires one arg (but allow two
  for compatibility).

Change-Id: I692d626185af24620382f7b318c2b77f643ccfb8
sr: Update to Patch Set 10
bu: backup/restore progress patch set 2
sr: touch: Only detect release if pressed

This fixes spurious release events for type a devices with
hardware keys.

Change-Id: I866193b34083e6b7b21c91a915c0ed0250fb2ebf