dependabot.yml: fix mechanism

Author: tro

.github/dependabot.yml

@@ -10,37 +10,5 @@ updates:
       layers:
         patterns:
           - "poky"
-    target-branch: "master-next"
-  - package-ecosystem: gitsubmodule
-    directory: "/layers/agl"
-    commit-message:
-      prefix: "meta-*: "
-    schedule:
-      interval: "daily"
-    groups:
-      layers:
-        patterns:
-          - "meta-*"
-    target-branch: "master-next"         
-  - package-ecosystem: gitsubmodule
-    directory: "/layers/bsp"
-    commit-message:
-      prefix: "meta-*: "
-    schedule:
-      interval: "daily"
-    groups:
-      layers:
-        patterns:
-          - "meta-*"
-    target-branch: "master-next"          
-  - package-ecosystem: gitsubmodule
-    directory: "/layers/sw"
-    commit-message:
-      prefix: "meta-*: "
-    schedule:
-      interval: "daily"
-    groups:
-      layers:
-        patterns:
           - "meta-*"
     target-branch: "master-next"