chrome platform changes for 6.5

* Improvements

  - Support Pin Assignment D in getting mux state.
  - Emit an uevent when EC panics so that userland programs get chance
    to capture EC coredumps (LPC interface only).
  - Send EC_CMD_HOST_SLEEP_EVENT to EC at the very beginning/end of
    system suspend/resume so that EC can watch the duration more
    accurately (LPC interface only).

* Misc

  - Switch back from I2C .probe_new() to .probe().
  - Use %*ph for printing hexdump of small buffers.
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