drm/amd/amdgpu/amdgpu_vce: Provide description for amdgpu_vce_validate_bo()'s 'p' param

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

 drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c:599: warning: Function parameter or member 'p' not described in 'amdgpu_vce_validate_bo'

v2: reword (Alex)

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: David Airlie <airlied@gmail.com>
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@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -585,6 +585,7 @@ static int amdgpu_vce_get_destroy_msg(struct amdgpu_ring *ring, uint32_t handle,
 /**
  * amdgpu_vce_validate_bo - make sure not to cross 4GB boundary
  *
+ * @p: cs parser
  * @ib: indirect buffer to use
  * @lo: address of lower dword
  * @hi: address of higher dword