Version 2: Provide /sys/../ec with read/write access and some cleanups

[Thomas Renninger]

This patchset is againt the acpi test branch.
It would be great if these can be applied there.
Patches are test compiled, booted and I played a bit with reading
writing...

Changes to the previous patchset:
    - Use debugfs /sys/kernel/debug/ec/* instead of /sys/devices/...
    - Keep some EC Documentation in the thinkpad driver
    - Add Documentation/ABI describing the new interface

Possible further enhancements:
    - Expose EC Fields and make them read/writable
    - Allow userspace to switch on burst mode to be able to test
      EC burst transitions in userspace

Thanks,

       Thomas

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