Add min_sdk_version:R to updatable apexes

APEXes introduced in R need to set min_sdk_version to ensure that they
are built against correct version of stubs (libc/liblog/...).

Bug: 152655956
Test: m
Merged-In: I4a893c34b09334eea124266287301e479b9e8a59
Change-Id: I4a893c34b09334eea124266287301e479b9e8a59
(cherry picked from commit f1460fad5252dfea1031c463a40e4202cf1d24e9)
diff --git a/Tethering/apex/Android.bp b/Tethering/apex/Android.bp
index 96a4d20..24df5f6 100644
--- a/Tethering/apex/Android.bp
+++ b/Tethering/apex/Android.bp
@@ -17,6 +17,7 @@
 apex {
     name: "com.android.tethering",
     updatable: true,
+    min_sdk_version: "R",
     java_libs: ["framework-tethering"],
     apps: ["Tethering"],
     manifest: "manifest.json",