Add bionic headers for process_madvise

Test: atest bionic-unit-tests-static
Bug: 173258203
Change-Id: I396945b95de364055b87cc53321aed4fad4ebc70
diff --git a/libc/libc.map.txt b/libc/libc.map.txt
index a17a33f..f4f35ac 100644
--- a/libc/libc.map.txt
+++ b/libc/libc.map.txt
@@ -1552,12 +1552,13 @@
 
 LIBC_S { # introduced=S
   global:
-    ffsl;
-    ffsll;
     __libc_get_static_tls_bounds;
     __libc_register_thread_exit_callback;
     __libc_iterate_dynamic_tls;
     __libc_register_dynamic_tls_listeners;
+    ffsl;
+    ffsll;
+    process_madvise;
 } LIBC_R;
 
 LIBC_PRIVATE {