st/va: delay decoder creation until max_references is known

In general max_references cannot be based on num_render_targets.

This patch allows to allocate buffers with an accurate size.
I.e. no more than necessary. For other codecs it is a fixed
value 2.

This is similar behaviour as vaapi/vdpau-driver.

For now HEVC case defaults to num_render_targets as before.
But it could also benefits this change by setting a more
accurate max_references number in handlePictureParameterBuffer.

Signed-off-by: Julien Isorce <[email protected]>
Reviewed-by: Christian König <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>

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