drm/amd/amdgpu/gmc_v7_0: Add some missing kernel-doc descriptions

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

 drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c:433: warning: Function parameter or member 'flush_type' not described in 'gmc_v7_0_flush_gpu_tlb_pasid'
 drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c:433: warning: Function parameter or member 'all_hub' not described in 'gmc_v7_0_flush_gpu_tlb_pasid'
 drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c:471: warning: Function parameter or member 'vmhub' not described in 'gmc_v7_0_flush_gpu_tlb'
 drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c:471: warning: Function parameter or member 'flush_type' not described in 'gmc_v7_0_flush_gpu_tlb'
 drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c:771: warning: Function parameter or member 'pasid' not described in 'gmc_v7_0_vm_decode_fault'

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: 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>