[CI] Update Jenkinsfile with platform path

docker/jenkins/Jenkinsfile

@@ -9,7 +9,7 @@ node {
         "FINN_XILINX_VERSION=2022.1",
         "FINN_DOCKER_TAG=xilinx/finn:jenkins",
         "FINN_HOST_BUILD_DIR=/scratch/users/finn_ci",
-        "PLATFORM_REPO_PATHS=/opt/xilinx/dsa"
+        "PLATFORM_REPO_PATHS=/opt/xilinx/platforms"
     ]){
         parallel firstBranch: {
             stage('Brevitas export') {