drm/amd/amdgpu/amdgpu_fence: Fix some issues pertaining to function documentation

drm/amd/amdgpu/amdgpu_fence: Fix some issues pertaining to function documentation

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

 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:139: warning: Function parameter or member 'flags' not described in 'amdgpu_fence_emit'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:197: warning: Function parameter or member 'timeout' not described in 'amdgpu_fence_emit_polling'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:302: warning: Function parameter or member 't' not described in 'amdgpu_fence_fallback'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:302: warning: Excess function parameter 'work' description in 'amdgpu_fence_fallback'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:320: warning: Excess function parameter 'adev' description in 'amdgpu_fence_wait_empty'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:649: warning: Function parameter or member 'f' not described in 'amdgpu_fence_enable_signaling'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:649: warning: Excess function parameter 'fence' description in 'amdgpu_fence_enable_signaling'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:684: warning: Function parameter or member 'f' not described in 'amdgpu_fence_release'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:684: warning: Excess function parameter 'fence' description in 'amdgpu_fence_release'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:749: warning: Function parameter or member 'm' not described in 'amdgpu_debugfs_gpu_recover'
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c:749: warning: Function parameter or member 'data' not described in 'amdgpu_debugfs_gpu_recover'

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: Jerome Glisse <glisse@freedesktop.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>