drm/amd/amdgpu/cik_ih: Supply description for 'ih' in 'cik_ih_{get, set}_wptr()'

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

 drivers/gpu/drm/amd/amdgpu/cik_ih.c:189: warning: Function parameter or member 'ih' not described in 'cik_ih_get_wptr'
 drivers/gpu/drm/amd/amdgpu/cik_ih.c:274: warning: Function parameter or member 'ih' not described in 'cik_ih_set_rptr'
Acked-by: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Qinglang Miao <miaoqinglang@huawei.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/cik_ih.c

@@ -177,6 +177,7 @@ static void cik_ih_irq_disable(struct amdgpu_device *adev)
  * cik_ih_get_wptr - get the IH ring buffer wptr
  *
  * @adev: amdgpu_device pointer
+ * @ih: IH ring buffer to fetch wptr
  *
  * Get the IH ring buffer wptr from either the register
  * or the writeback memory buffer (CIK).  Also check for
@@ -266,6 +267,7 @@ static void cik_ih_decode_iv(struct amdgpu_device *adev,
  * cik_ih_set_rptr - set the IH ring buffer rptr
  *
  * @adev: amdgpu_device pointer
+ * @ih: IH ring buffer to set wptr
  *
  * Set the IH ring buffer rptr.
  */