drm/doc: Add PRIME function references

For giant hilarity the DocBook reference overview is only generated
when in a level 2 section, not in a level 3 section. So we need to
move this up a bit as a side-by-side section to the main PRIME
documentation.

Whatever.

To have a complete set of references add the missing kerneldoc for all
functions exported to modules with the exception of the file private
init/destroy functions - drivers have no business calling those, so
let's just drop the EXPORT_SYMBOL instead.

Also reflow the function parameters to align correctly and break at 80
chars - my OCD couldn't stand them while writing the kerneldoc ;-)

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 641db5c..f83622e 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -898,10 +898,14 @@
 	  </para>
 	</sect3>
         <sect3>
-          <title>PRIME Helper Functions Reference</title>
+          <title>PRIME Helper Functions</title>
 !Pdrivers/gpu/drm/drm_prime.c PRIME Helpers
         </sect3>
       </sect2>
+      <sect2>
+	<title>PRIME Function References</title>
+!Edrivers/gpu/drm/drm_prime.c
+      </sect2>
   </sect1>
 
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