Moving decision to use still camera to CameraSourceTimeLapse

CameraSourceTimeLapse now decides whether to use still or video
camera automatically. It checks if the passed in size is a valid
preview size and if it is, then uses the video camera else uses
the still camera.

Removed from StagefrightRecorder the support to set parameter
useStillCameraForTimeLapse.

Change-Id: I71f5b0fc7080ca524792381efe918d22e41a7f36