libcamera: src: ipa: raspberrypi: agc: Improve AE locked logic

Previously we required that the sensor absolutely reaches the target
exposure, but this can fail if frame rates or analogue gains are
limited. Instead insist only that we get several frames with the same
exposure time, analogue gain and that the algorithm's target exposure
hasn't changed either.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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