camera: add iso parameter

Enable with BOARD_CAMERA_HAVE_ISO

From: jt1134 <jt1134@gmail.com>
Date: Mon, 17 Sep 2012 22:05:04 -0500
Subject: [PATCH] camera: add define for ISO settings

Change-Id: I8716a260ad552d3684197237c2055dce129e461e
---