I've just folded in a bunch of changes I made to the lms and mms
drivers a while back.  Among other things, these versions do non-
blocking mode correctly, so it's not necessary to use a bit in the
minor number any more.

Of course, this also means the format of the minor numbers has
changed.  It's now the same as the unit number.  I updated MAKEDEV
to know about this.


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