media: amphion: Trigger source change if colorspace changed

media: amphion: Trigger source change if colorspace changed

After encountering a colorspace change in the stream, the decoder
sends a V4L2_EVENT_SOURCE_CHANGE event with changes set to
V4L2_EVENT_SRC_CH_RESOLUTION.

Then the client can detect and handle the colorspace change without any
buffer reallocation

Signed-off-by: Ming Qian <ming.qian@oss.nxp.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>