convert all steps to use sh in jenkins

Jenkinsfile

@@ -6,21 +6,21 @@ pipeline {
             agent any 
             steps {
                 echo 'Fetching Assets'
-		git submodule update --init --recursive
-		git submodule update --remote --merge
+		sh "git submodule update --init --recursive"
+		sh "git submodule update --remote --merge"
             }
         }
         stage('Patch Assets') {
             agent any
             steps {
-                sh("./scripts/br-patches.sh")
+                sh "./scripts/br-patches.sh"
             }
         }
 	stage('Build Assets') {
 	    agent any
 	    steps {
-		make clean
-		make rpi4_64-gui
+		sh "make clean"
+		sh "make rpi4_64-gui"
 	    }
 	}
 	stage('Deploy Image'){