drm/radeon: Add early unregister of firmware fb's
Without this, we attempt the handover too late, the firmware fb might be accessing the chip simultaneously to us re-initializing various parts of it, which might frighten babies or cause all sort of nasty psychologic trauma to kitten. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [danvet: add cc: stable, forward ported and compile-fixed for X86] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> [airlied: move to even earlier in module load.] Signed-off-by: Dave Airlie <airlied@redhat.com>
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