MHI Host

========

- Fixed the module description

MHI Endpoint
============

- Powered down the MHI EP stack completely during MHI RESET instead of just
  doing transfer abort as the MMIO register access will be prohibited
  afterwards. EP stack will also be powered on again in case the RESET
  happened due to SYS_ERR.

- Added a sanity check before processing the command ring to make sure that
  the channel is supported by the controller.

- Added a check to make sure the xfer_cb is available for the channel
  before trying to send the error status to the client drivers. This
  helps in avoiding a potential null pointer dereference.

- Fixed the debug log of RESET command

- Modified the channel ring handler lock to protect the whole handler
  instead of locking it partially. This helps in avoiding a race that may
  happen if a channel STOP/RESET command is issued by the host parallely.

- Saved the MHI state locally during suspend and resume. Otherwise, the MHI
  EP stack will not be aware of a channel that got disabled and may try to
  access it later.

- Changed the MHI state_lock to mutex instead of spinlock. This helps in
  avoiding the sleeping in atomic bug reported by Dan Carpenter and also
  allows the lock to be held throughout the state change.

- Fixed the off by one error while doing the MHI channel check during
  command ring processing.

MHI Generic
===========

- Updated the MHI toplevel Makefile to use Kconfig flags for building the
  host and endpoint sub-directories conditionally.
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