Set min_sdk_version for updatable mainline modules

Modules contributing mainline modules (APK/APEX) should set
min_sdk_version as well as apex_available.

For now setting min_sdk_version doesn't change build outputs.
But build-time checks will be added soon.

Bug: 145796956
Bug: 150999716
Test: m
Change-Id: Ifaecb49a47a1f43edea3ea06e1cf704a177d1044
diff --git a/Tethering/common/TetheringLib/Android.bp b/Tethering/common/TetheringLib/Android.bp
index 8ae1593..7ac9d25 100644
--- a/Tethering/common/TetheringLib/Android.bp
+++ b/Tethering/common/TetheringLib/Android.bp
@@ -37,6 +37,12 @@
         cpp: {
             enabled: false,
         },
+        java: {
+            apex_available: [
+                "//apex_available:platform",
+                "com.android.tethering",
+            ],
+        },
     },
 }