Add a human readable description of the tagged_addr_ctrl value to tombstones.

Change-Id: Ib9860b282cf749891e0f6ef7697669b94235c236
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index 59643d9..75f9921 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -343,7 +343,8 @@
 
   if (mte_supported()) {
     // Test that the default TAGGED_ADDR_CTRL value is set.
-    ASSERT_MATCH(result, R"(tagged_addr_ctrl: 000000000007fff3)");
+    ASSERT_MATCH(result, R"(tagged_addr_ctrl: 000000000007fff3)"
+                         R"( \(PR_TAGGED_ADDR_ENABLE, PR_MTE_TCF_SYNC, mask 0xfffe\))");
   }
 }