update(lib_image):Adding LIB_IMAGE ENV in node cpu/memory hog experiment (#204)

Signed-off-by: shubhamchaudhary <shubham.chaudhary@mayadata.io>

charts/generic/node-memory-hog/engine.yaml

@@ -30,13 +30,4 @@ spec:
             ## specify the size as percent of total available memory (in percentage %)
             ## default value 90%
             - name: MEMORY_PERCENTAGE
-              value: '90'   
-
-             # It supprts GKE and EKS Platform
-             # GKE is the default Platform
-            - name: PLATFORM
-              value: 'GKE'
-              
-            # chaos lib used to inject the chaos
-            - name: LIB
-              value: 'litmus'
+              value: '90'