MHI Host

========

- Added new MHI_PM_SYS_ERR_FAIL state to the MHI state machine to properly
  cleanup the channel state if the device fails to respond to the MHI reset
  during SYS_ERR handling. This issue was discovered with the Qualcomm AIC100 AI
  accelerator device.

- Modified the code that reads and exposes the OEM_PK_HASH registers through
  sysfs to read them on-demand instead of reading once during boot. Qualcomm
  AIC100 devices support provisioning the keys dynamically, so this allows the
  users to know the upto date information.

- Added tracepoint support to expose the debug information over tracefs.

- Reverted the commit that reads the MHI device revision from the device during
  boot. This is done because the read info was not used anywhere (dead code) and
  also it is not possible to read the revision info from all the devices.

- Constified the modem config for Telit FN980 modem as required by the MHI core.

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

- Replaced kzalloc() with kcalloc() in an effort to avoid integer overflows
  during multiplication. Even though there is no potential overflow in the
  endpoint code, this is done for the sake of uniformity and best practice.

- Fixed the kmem_cache_create() failure check to use the correct variable.
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