Combine the midi and sequencer modules into a single midi_seq module
to avoid a circular dependency as noted in kern/56772. Retain minimal
modules of the original names to accomodate auto-loading up

Combine the midi and sequencer modules into a single midi_seq module
to avoid a circular dependency as noted in kern/56772. Retain minimal
modules of the original names to accomodate auto-loading upon access
to the /dev/xxx nodes.

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