Added netd_integration_test to TEST_MAPPING

Kernel changes can cause networking regressions. Start testing
for these failures.

Also remove extraneous kernel header file

Bug: 146571786
Test: Treehugger
Change-Id: I4b31bf68d3fc448db17cde1250f95811426654ca
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 082bb49..4342bde 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,6 +1,9 @@
 {
   "presubmit": [
     {
+      "name": "netd_integration_test"
+    },
+    {
       "name": "CtsBionicTestCases"
     },
     {