media: hantro: relax s_fmt(out) busy error

Setting the output format resets the capture queue, so we return -EBUSY
while the capture queue has buffers allocated. If capture dimensions
and pixel format don't change though, we can allow setting the output
format without reallocating the capture queue.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>