ipa: rpi: agc: Fetch AWB status in the prepare method

AWB writes this out during prepare, so we may as well read it in AGC
prepare as well. Reading it in process is wrong on the PiSP platform
because process runs before prepare, so the AWB status won't be there
(on vc4 it made no difference).

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

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