zenfone7: Decommonize kernel source

Change-Id: I948048ba1d82e9b41ef416636996c3a9f143cb40
diff --git a/omni.dependencies b/omni.dependencies
index 05205aa..68ad3aa 100644
--- a/omni.dependencies
+++ b/omni.dependencies
@@ -4,5 +4,11 @@
     "repository": "android_device_asus_sm8250-common",
     "target_path": "device/asus/sm8250-common",
     "revision": "android-11"
+  },
+  {
+    "remote": "omnirom",
+    "repository": "android_kernel_asus_sm8250",
+    "target_path": "kernel/asus/sm8250",
+    "revision": "android-11"
   }
 ]