camera2: fix pref_camera_picturesize_entryvalues values order

The value for 1024x768 is out of order in the
pref_camera_picturesize_entryvalues array.

On the Kindle Fire HD, this causes Camera2 to select a picture size
of 1024x768 instead of the max supported resolution of 1280x720.

Change-Id: If15a3d6d20679f691e61d80288e9e47c8f8f5937