[camera] Fix crashes on some Android devices

Author: najeira

packages/camera/camera/android/src/main/java/io/flutter/plugins/camera/Camera.java

@@ -216,7 +216,6 @@ public void open(String imageFormatGroup) throws CameraAccessException {
           public void onOpened(@NonNull CameraDevice device) {
             cameraDevice = device;
             try {
-              cameraRegions = new CameraRegions(getRegionBoundaries());
               startPreview();
               dartMessenger.sendCameraInitializedEvent(
                   previewSize.getWidth(),
@@ -300,6 +299,8 @@ private void createCaptureSession(
       }
     }
 
+    cameraRegions = new CameraRegions(getRegionBoundaries());
+
     // Prepare the callback
     CameraCaptureSession.StateCallback callback =
         new CameraCaptureSession.StateCallback() {