Codec2CommonUtils: Restrict encoder usage checks to Android U and above

Bug: 293985442
Test: atest CtsMediaV2TestCases:CodecInfoTest

Change-Id: I55543617d8a9e9765d427b289bd42e667bbcb917
diff --git a/media/codec2/sfplugin/utils/Codec2CommonUtils.h b/media/codec2/sfplugin/utils/Codec2CommonUtils.h
index 98dd65b..9bb52bd 100644
--- a/media/codec2/sfplugin/utils/Codec2CommonUtils.h
+++ b/media/codec2/sfplugin/utils/Codec2CommonUtils.h
@@ -23,6 +23,8 @@
 
 bool isAtLeastT();
 
+bool isAtLeastU();
+
 bool isVendorApiOrFirstApiAtLeastT();
 
 /**