Remove the global dock variable.  Each dock device should be able to function independently.  This change is not only load-tested since I don't have hardware that supports acpi_dock.  Clean up comments and a name a few constants.
Remove the global dock variable.  Each dock device should be able to
function independently.  This change is not only load-tested since I don't
have hardware that supports acpi_dock.  Clean up comments and a name a
few constants.

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