drm/amd/amdgpu/gmc_v10_0: Suppy some missing function doc descriptions

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

 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c:278: warning: Function parameter or member 'vmhub' not described in 'gmc_v10_0_flush_gpu_tlb'
 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c:278: warning: Function parameter or member 'flush_type' not described in 'gmc_v10_0_flush_gpu_tlb'
 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c:371: warning: Function parameter or member 'flush_type' not described in 'gmc_v10_0_flush_gpu_tlb_pasid'
 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c:371: warning: Function parameter or member 'all_hub' not described in 'gmc_v10_0_flush_gpu_tlb_pasid'

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: Sumit Semwal <sumit.semwal@linaro.org>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c

@@ -297,6 +297,8 @@ static void gmc_v10_0_flush_vm_hub(struct amdgpu_device *adev, uint32_t vmid,
  *
  * @adev: amdgpu_device pointer
  * @vmid: vm instance to flush
+ * @vmhub: vmhub type
+ * @flush_type: the flush type
  *
  * Flush the TLB for the requested page table.
  */
@@ -389,6 +391,8 @@ static void gmc_v10_0_flush_gpu_tlb(struct amdgpu_device *adev, uint32_t vmid,
  *
  * @adev: amdgpu_device pointer
  * @pasid: pasid to be flush
+ * @flush_type: the flush type
+ * @all_hub: Used with PACKET3_INVALIDATE_TLBS_ALL_HUB()
  *
  * Flush the TLB for the requested pasid.
  */