Set min_sdk_version to be part of 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: 152655956
Test: m
Change-Id: I2fb918ae28dcc69869e7f79054f42e0d3b558676
diff --git a/Android.bp b/Android.bp
index ad11334..e3f7445 100644
--- a/Android.bp
+++ b/Android.bp
@@ -34,6 +34,7 @@
             apex_available: [
                 "com.android.resolv",
             ],
+            min_sdk_version: "29",
         },
     },
     versions: [
@@ -172,6 +173,7 @@
         cfi: true,
     },
     apex_available: ["com.android.resolv"],
+    min_sdk_version: "29",
 }
 
 cc_library_static {
@@ -185,6 +187,7 @@
         "stats.proto",
     ],
     apex_available: ["com.android.resolv"],
+    min_sdk_version: "29",
 }
 
 genrule {
@@ -217,6 +220,7 @@
         "libstatspush_compat",
     ],
     apex_available: ["com.android.resolv"],
+    min_sdk_version: "29",
 }
 
 filegroup {