camera: Revert "camera: add conffig option to prefer mjpeg"

This reverts commit f0af207.

Author: Su Yue

chromeos-base/chromeos-bsp-fydetab_duo-openfyde/files/camera/camera_characteristics.conf

@@ -19,4 +19,3 @@ camera0.module0.vertical_view_angle_16_9=40.8
 camera0.module0.vertical_view_angle_4_3=40.5
 camera0.module0.constant_framerate_unsupported=true
 camera0.module0.resolution_1280x960_unsupported=true
-camera0.module0.quirks=prefer_mjpeg