Move CtsNetTestCasesLatestSdk to presubmit

The last 19 runs have been green. This is already in presubmit in other
branches.

Note that mainline-presubmit is still not supported in some branches.

Bug: 158153057
Test: m
Merged-In: I9d7954503990902ae807d74de14f4a2874328072

Change-Id: I9d7954503990902ae807d74de14f4a2874328072
diff --git a/tests/cts/net/TEST_MAPPING b/tests/cts/net/TEST_MAPPING
index 3162e22..9167c98 100644
--- a/tests/cts/net/TEST_MAPPING
+++ b/tests/cts/net/TEST_MAPPING
@@ -1,6 +1,6 @@
 {
   // TODO: move to mainline-presubmit once supported
-  "postsubmit": [
+  "presubmit": [
     {
       "name": "CtsNetTestCasesLatestSdk",
       "options": [