g the omapdss code required by
omapfb + omap_vout to separate files, creating a distinct layer used only by
omapfb + omap_vout. We call this layer "compat layer". This compat layer then
uses the core omapdss driver to operate the hardware. omapdrm will use the core
omapdss directly, without any layers in between.

After this series, omapfb, omap_vout and omapdrm can all be compiled at the
same time. Obviously omapdrm and omapfb+omap_vout cannot be run at the same
time (the first one to start will "win"), so compiling them at the same time is
only sensible as modules for testing purposes. Normal users should only compile
one of those.

This series does not make omapdrm use the core omapdss API, that will happen in
a separate series for omapdrm.
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