Add new internal APIs for camera status of AE and AWB

Add new internal APIs for camera status of AE and AWB

- enum
 : camera_status_auto_exposure_e
   CAMERA_STATUS_AUTO_EXPOSURE_NONE
   CAMERA_STATUS_AUTO_EXPOSURE_UNSTABLE
   CAMERA_STATUS_AUTO_EXPOSURE_STABLE
 : camera_status_auto_white_balance_e
   CAMERA_STATUS_AUTO_WHITE_BALANCE_NONE
   CAMERA_STATUS_AUTO_WHITE_BALANCE_UNSTABLE
   CAMERA_STATUS_AUTO_WHITE_BALANCE_STABLE
- function
 : int camera_attr_get_preview_frame_status_auto_exposure(camera_h camera, camera_status_auto_exposure_e *status);
 : int camera_attr_get_preview_frame_status_auto_white_balance(camera_h camera, camera_status_auto_white_balance_e *status);

[Version] 0.4.113
[Issue Type] New feature

Change-Id: Ic65317db473b3b32e0ea72a63746756bf748824b
Signed-off-by: Jeongmo Yang <jm80.yang@samsung.com>