CameraService: Add support for module init, some logging updates

- Add support for camera HAL module init() method on v2.4
- Add logging for service errors such as failure to init
- Minor cleanup to dumping of event log

Bug: 20016050
Change-Id: I94e18b52c186f16fb096457015f7ae761e867fd8
diff --git a/services/camera/libcameraservice/common/CameraModule.h b/services/camera/libcameraservice/common/CameraModule.h
index e285b21..c21092e 100644
--- a/services/camera/libcameraservice/common/CameraModule.h
+++ b/services/camera/libcameraservice/common/CameraModule.h
@@ -34,6 +34,10 @@
 public:
     CameraModule(camera_module_t *module);
 
+    // Must be called after construction
+    // Returns OK on success, NO_INIT on failure
+    int init();
+
     int getCameraInfo(int cameraId, struct camera_info *info);
     int getNumberOfCameras(void);
     int open(const char* id, struct hw_device_t** device);
@@ -63,4 +67,3 @@
 } // namespace android
 
 #endif
-