DO NOT MERGE: Disable tethering.inprocess APEX in stable branch

Disable the tethering.inprocess APEX in stable API module
branch, as it builds against unstable API stubs that cannot be
built there.

Ignore-AOSP-First: this allows avoiding merge conflicts in AOSP
Bug: 190249673
Change-Id: I474faea75293f33fa4cd53c7619087503c658b74
Test: m
diff --git a/Tethering/apex/Android.bp b/Tethering/apex/Android.bp
index 012dcff..78ec2e0 100644
--- a/Tethering/apex/Android.bp
+++ b/Tethering/apex/Android.bp
@@ -31,7 +31,7 @@
     // package names and keys, so that apex will be unused anyway.
     apps: ["Tethering"], // Replace to "Tethering" if ConnectivityNextEnableDefaults is false.
 }
-enable_tethering_next_apex = true
+enable_tethering_next_apex = false
 // This is a placeholder comment to avoid merge conflicts
 // as the above target may have different "enabled" values
 // depending on the branch