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/CameraService.h b/services/camera/libcameraservice/CameraService.h
index 91c7d59..84e61c5 100644
--- a/services/camera/libcameraservice/CameraService.h
+++ b/services/camera/libcameraservice/CameraService.h
@@ -590,6 +590,16 @@
      */
     void logClientDied(int clientPid, const char* reason);
 
+    /**
+     * Add a event log message that a serious service-level error has occured
+     */
+    void logServiceError(const char* msg, int errorCode);
+
+    /**
+     * Dump the event log to an FD
+     */
+    void dumpEventLog(int fd);
+
     int                 mNumberOfCameras;
 
     // sounds