framework-tethering: baseline FlaggedApi Lint violations

The FlaggedApi Lint violations will soon be configured to be errors
instead of warnings. Baseline existing violations.

Bug: 303434307
Test: m framework-tethering.impl-lint
Flag: EXEMPT not possible to flag baseline changes
Ignore-AOSP-First: violation not found in AOSP
Change-Id: I3c98e7a32266867bd7e900248adea94ff9d4be46
diff --git a/Tethering/common/TetheringLib/Android.bp b/Tethering/common/TetheringLib/Android.bp
index 9fa073b..39a7540 100644
--- a/Tethering/common/TetheringLib/Android.bp
+++ b/Tethering/common/TetheringLib/Android.bp
@@ -58,6 +58,7 @@
     permitted_packages: ["android.net"],
     lint: {
         strict_updatability_linting: true,
+        baseline_filename: "lint-baseline.xml",
     },
     aconfig_declarations: [
         "com.android.net.flags-aconfig",