drm: reorganise drm tree to be more future proof.

With the coming of kernel based modesetting and the memory manager stuff,
the everything in one directory approach was getting very ugly and
starting to be unmanageable.

This restructures the drm along the lines of other kernel components.

It creates a drivers/gpu/drm directory and moves the hw drivers into
subdirectores. It moves the includes into an include/drm, and
sets up the unifdef for the userspace headers we should be exporting.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index e0c5f96..9b887ef 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -7,7 +7,7 @@
 
 source "drivers/char/agp/Kconfig"
 
-source "drivers/char/drm/Kconfig"
+source "drivers/gpu/drm/Kconfig"
 
 config VGASTATE
        tristate