ipa: rpi: Prevent segfault if AGC algorithm is absentHEADmaster

Even without AGC definition in the tuning file, the application would
still dereference agc unconditionally, leading to a segmentation fault
if AGC is absent.
This is relevant for sensors already providing AGC/AEC by themselves.
Check if AGC is present prior to setting maximum exposure time.

Signed-off-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Tested-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> # RPi4 + imx708_wide
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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