ipa: rkisp1: agc: Restore minimum analogue gain limit

Commit a3178dd0391f ("ipa: rkisp1: agc: drop hard-coded analogue gain range")
removed both minimum and maximum limits for the analogue gain value.

However, as some sensors can potentially have a minimum gain lower than
1.0, restore the check for the minimum limit.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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