Add minSdkVersion in AndroidManifest for SpaLib & Gallery.

Bug: 244122804
Test: manual - build gallery
Change-Id: Id8c54243a6da468324594df062918e0917e216ac
diff --git a/packages/SettingsLib/Spa/tests/Android.bp b/packages/SettingsLib/Spa/tests/Android.bp
index 1ce49fa..7491045 100644
--- a/packages/SettingsLib/Spa/tests/Android.bp
+++ b/packages/SettingsLib/Spa/tests/Android.bp
@@ -34,4 +34,5 @@
         "truth-prebuilt",
     ],
     kotlincflags: ["-Xjvm-default=all"],
+    min_sdk_version: "31",
 }