Add xwxw to health/OWNERS

Bug: 346604998
Change-Id: I64bb5d669f4c46084b7a70ff16e4cd67e7a41f19
Flag: EXEMPT owners
Test: n/a
diff --git a/core/java/android/os/health/OWNERS b/core/java/android/os/health/OWNERS
index 6045344..26fc8fa 100644
--- a/core/java/android/os/health/OWNERS
+++ b/core/java/android/os/health/OWNERS
@@ -2,3 +2,6 @@
 
 dplotnikov@google.com
 mwachens@google.com
+
+# for headroom API only
+xwxw@google.com
\ No newline at end of file