gpu: nvgpu: add logging type for user events

- For debugging events to user we need a
  separate logging type for QNX. This is required
  as earlier we were using nvhost logging APIs
  but now we are removing all dependency from
  nvhost. Linux too can use this type if required.

Change-Id: I57a2a566be9208bb444cba72645eda06acc3d496
Signed-off-by: Shashank Singh <shashsingh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1955222
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/include/nvgpu/log.h

@@ -80,6 +80,7 @@ void __nvgpu_log_dbg(struct gk20a *g, u64 log_mask,
 #define	gpu_dbg_vidmem		BIT(24) /* VIDMEM tracing. */
 #define	gpu_dbg_nvlink		BIT(25) /* nvlink Operation tracing. */
 #define	gpu_dbg_clk_arb		BIT(26) /* Clk arbiter debugging. */
+#define	gpu_dbg_event		BIT(27) /* Events to User debugging. */
 #define	gpu_dbg_mem		BIT(31) /* memory accesses; very verbose. */
 
 /**