gpu: nvgpu: skip doxygen for userd HAL

All userd HALs are called from common.fifo or hal.fifo
Skip doxygen since no HAL is called from external unit.

Jira NVGPU-4157

Change-Id: Ie1d27faeb0d20b1d5f1634b1a6bb7a5e3c3c97e1
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2218536
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/include/nvgpu/gops_userd.h

@@ -22,6 +22,7 @@
 #ifndef NVGPU_GOPS_USERD_H
 #define NVGPU_GOPS_USERD_H
 
+/** @cond DOXYGEN_SHOULD_SKIP_THIS */
 #include <nvgpu/types.h>
 
 struct gk20a;
@@ -40,6 +41,6 @@ struct gops_userd {
 #endif
 
 };
-
+/** @endcond DOXYGEN_SHOULD_SKIP_THIS */
 
 #endif