update build status badge for FreeBSD

Change-Id: Ica7c654a1fd5681a92880a5c1a884f752d0977a0

Author: rdementi

README.md

@@ -16,7 +16,7 @@ Current Build Status
 
 - Linux: [![GitHub Workflow Status](https://img.shields.io/github/workflow/status/intel/pcm/Linux%20make)](https://github.com/intel/pcm/actions/workflows/linux_make.yml?query=branch%3Amaster)
 - Windows: [![Build status](https://ci.appveyor.com/api/projects/status/github/intel/pcm?branch=master&svg=true)](https://ci.appveyor.com/project/opcm/pcm)
-- FreeBSD: [![Build Status](https://api.cirrus-ci.com/github/opcm/pcm.svg)](https://cirrus-ci.com/github/opcm/pcm)
+- FreeBSD: [![GitHub Workflow Status](https://img.shields.io/github/workflow/status/intel/pcm/FreeBSD%20build)](https://github.com/intel/pcm/actions/workflows/freebsd_build.yml?query=branch%3Amaster)
 - OS X: [![GitHub Workflow Status](https://img.shields.io/github/workflow/status/intel/pcm/Mac%20OS%20X%20build)](https://github.com/intel/pcm/actions/workflows/macosx_build.yml?query=branch%3Amaster)
 - Docker container: [![GitHub Workflow Status](https://img.shields.io/github/workflow/status/intel/pcm/Docker%20Build)](doc/DOCKER_README.md)