serrano: Enable TARGET_VIDEO_PREVIEW_ALWAYS_MAX for camera HAL

 * Might be needed for 3rd party apps, so move it into HAL

Change-Id: I560a3101ea20780eca501c9f5cbcdbb7c7c0a907
serrano: Enable FFC video size fixup

 * 480p looks really weird on serrano

Change-Id: I00f9eeeef6843b2d9e88a48bea6249072e056b88