st/vdpau: change the order in which filters are applied(v3)

st/vdpau: change the order in which filters are applied(v3)

Apply the median and matrix filter before the compostioning
we apply the deinterlacing first to avoid the extra overhead
in processing the past and the future surfaces in deinterlacing.

v2: apply the filters on all the surfaces (Christian)
v3: use get_sampler_view_planes() instead of
    get_sampler_view_components() and iterate over
    VL_MAX_SURFACES (Christian)

Signed-off-by: Nayan Deshmukh <nayan26deshmukh@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>