pbcamera: Add nofityEaselFatalError

Add a function to notify HDR+ client when Easel encountered a fatal
error.

Test: CTS
Bug: 67897917
Change-Id: Id43c4196dda5f145a1850f9a85ea82b13eb24b67
(cherry picked from commit c13b5347063b4b2fa8363d25d89e1022c667b486)
diff --git a/camera/libhdrplusclient/include/HdrPlusClient.h b/camera/libhdrplusclient/include/HdrPlusClient.h
index 40905cc..31f7124 100644
--- a/camera/libhdrplusclient/include/HdrPlusClient.h
+++ b/camera/libhdrplusclient/include/HdrPlusClient.h
@@ -143,6 +143,12 @@
     virtual void notifyFrameMetadata(uint32_t frameNumber, const camera_metadata_t &resultMetadata,
             bool lastMetadata=true) = 0;
 
+    /*
+     * Notify Easel has encountered a fatal error and HDR+ client should stop sending messages
+     * to Easel.
+     */
+    virtual void nofityEaselFatalError() = 0;
+
 private:
     // Disallow copy and assign.
     HdrPlusClient(const HdrPlusClient&) = delete;