Add jdk.internal.math to package_allowed_list.txt (OpenJDK 11)

This is part of merging upstream changes from OpenJDK 11.28. This CL
adds jdk.internal.math to package_allowed_list.txt

Bug: 199067710
Test: atest CtsLibcoreOjTestCases
Change-Id: I343bed53ce6b52a6b373a75828b3234073b9cba8
diff --git a/scripts/check_boot_jars/package_allowed_list.txt b/scripts/check_boot_jars/package_allowed_list.txt
index 18ab427..942f26a 100644
--- a/scripts/check_boot_jars/package_allowed_list.txt
+++ b/scripts/check_boot_jars/package_allowed_list.txt
@@ -69,6 +69,7 @@
 javax\.xml\.transform\.stream
 javax\.xml\.validation
 javax\.xml\.xpath
+jdk\.internal\.math
 jdk\.internal\.util
 jdk\.internal\.vm\.annotation
 jdk\.net