[PATCH 03/26] rt2x00: descriptors

Remove txd and rxd descriptor structures.
All access to the descriptors should be done
by treating the descriptor as a register.
For this we do add a desc structure containing
a array, and several methods for reading and writing
to that array.
This is prepares rt2x00 for the overhaul of the
byteordering mechanism.

Signed-off-by Ivo van Doorn [off-list ref]

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http://www.mendiosus.nl/rt2x00/03_descriptor.diff