Add definition for struct to be used in post processing calibration API. Needed by OEM calibration tool to provide better support of post processing features. Change-Id: I40760a85bb58730bfe64469ecf3e2ab3b6e7609e Signed-off-by: Carl Vanderlip <carlv@codeaurora.org> (cherry picked from commit e8ed5ec0bd9fd5b298464b7f08b5807afa3291a8)