allow MTS run on older SDK

Bug: 184795491
Test: atest
Change-Id: I0fb5cd82f7cb11a4aa18792e7f2783f3ee89cad4
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
index 95bb6dd..18eaf02 100644
--- a/tests/unit/Android.bp
+++ b/tests/unit/Android.bp
@@ -69,6 +69,7 @@
         "SettingsLibSettingsTheme",
         "SettingsLibCollapsingToolbarBaseActivity"
     ],
+    min_sdk_version: "30",
 }
 
 
diff --git a/tests/unit/AndroidManifest_OemTesting.xml b/tests/unit/AndroidManifest_OemTesting.xml
index 06bb11e..e3ae78c 100644
--- a/tests/unit/AndroidManifest_OemTesting.xml
+++ b/tests/unit/AndroidManifest_OemTesting.xml
@@ -40,6 +40,7 @@
         android:targetPackage="com.android.cellbroadcastreceiver.tests.unit"
         android:label="CellBroadcastReceiver OEM Unit Test Cases">
     </instrumentation>
+    <uses-sdk android:minSdkVersion="30" android:targetSdkVersion="30" />
 
 </manifest>