Merge pull request #25565 from savuor:rv/hal_eq_hist

Merge pull request #25565 from savuor/rv/hal_eq_hist

HAL for equalizeHist() added #25565

fixes #25530

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/imgproc/src/histogram.cpp

@@ -3452,6 +3452,8 @@ void cv::equalizeHist( InputArray _src, OutputArray _dst )
     CV_OVX_RUN(!ovx::skipSmallImages<VX_KERNEL_EQUALIZE_HISTOGRAM>(src.cols, src.rows),
                openvx_equalize_hist(src, dst))
 
+    CALL_HAL(equalizeHist, cv_hal_equalize_hist, src.data, src.step, dst.data, dst.step, src.cols, src.rows);
+
     Mutex histogramLockInstance;
 
     const int hist_sz = EqualizeHistCalcHist_Invoker::HIST_SZ;