add plugin macro in testframeowrk build job

Author: Prathyushakothuru

.github/workflows/L2-tests.yml

@@ -413,6 +413,7 @@ jobs:
           -DCMAKE_DISABLE_FIND_PACKAGE_RBus=ON
           -DPLUGIN_AVINPUT=OFF
           -DPLUGIN_AVOUTPUT=OFF
+          -DPLUGIN_DUMMY=ON
           -DAVOUTPUT_TV=OFF
           -DUSE_THUNDER_R4=ON
           -DPLUGIN_L2Tests=ON