drm/msm/disp/dpu1/dpu_hw_interrupts: Demote kernel-doc formatting misuse

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c:246: error: Cannot parse struct or union!
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c:756: error: Cannot parse struct or union!

Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Shubhashree Dhar <dhar@codeaurora.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c

@@ -189,7 +189,7 @@ struct dpu_irq_type {
 	u32 reg_idx;
 };
 
-/**
+/*
  * struct dpu_intr_reg -  List of DPU interrupt registers
  */
 static const struct dpu_intr_reg dpu_intr_set[] = {
@@ -245,7 +245,7 @@ static const struct dpu_intr_reg dpu_intr_set[] = {
 	}
 };
 
-/**
+/*
  * struct dpu_irq_type - IRQ mapping table use for lookup an irq_idx in this
  *			 table that have a matching interface type and
  *			 instance index.