Turn on XOM for libm

Test: bionic-unit-tests
Bug: 122993571
Bug: 123241361
Change-Id: I070d3a2627ee64124ff415a646ddfbcc767b54d1
diff --git a/libm/Android.bp b/libm/Android.bp
index 079220b..5075fb2 100644
--- a/libm/Android.bp
+++ b/libm/Android.bp
@@ -508,9 +508,6 @@
     },
     stl: "none",
 
-    // TODO(ivanlozano): Remove after b/118321713
-    xom: false,
-
     stubs: {
         symbol_file: "libm.map.txt",
         versions: ["10000"],