Move __system_property* to LIBC_PRIVATE for lp64 libc

Bug: http://b/26367254
Change-Id: I4fc241e69444a4b5641dfdf09576fe3ce5c1169e
diff --git a/libc/libc.mips64.map b/libc/libc.mips64.map
index e54bef6..7dee1c5 100644
--- a/libc/libc.mips64.map
+++ b/libc/libc.mips64.map
@@ -131,21 +131,6 @@
     __sym_ntop;
     __sym_ntos;
     __sym_ston;
-    __system_properties_init;
-    __system_property_add;
-    __system_property_area__;
-    __system_property_area_init;
-    __system_property_area_serial;
-    __system_property_find;
-    __system_property_find_nth;
-    __system_property_foreach;
-    __system_property_get;
-    __system_property_read;
-    __system_property_serial;
-    __system_property_set;
-    __system_property_set_filename;
-    __system_property_update;
-    __system_property_wait_any;
     __umask_chk;
     __vsnprintf_chk;
     __vsprintf_chk;
@@ -1179,6 +1164,21 @@
 
 LIBC_PRIVATE {
   global:
+    __system_properties_init; # arm64 x86_64 mips64
+    __system_property_add; # arm64 x86_64 mips64
+    __system_property_area__; # arm64 x86_64 mips64
+    __system_property_area_init; # arm64 x86_64 mips64
+    __system_property_area_serial; # arm64 x86_64 mips64
+    __system_property_find; # arm64 x86_64 mips64
+    __system_property_find_nth; # arm64 x86_64 mips64
+    __system_property_foreach; # arm64 x86_64 mips64
+    __system_property_get; # arm64 x86_64 mips64
+    __system_property_read; # arm64 x86_64 mips64
+    __system_property_serial; # arm64 x86_64 mips64
+    __system_property_set; # arm64 x86_64 mips64
+    __system_property_set_filename; # arm64 x86_64 mips64
+    __system_property_update; # arm64 x86_64 mips64
+    __system_property_wait_any; # arm64 x86_64 mips64
     free_malloc_leak_info;
     get_malloc_leak_info;
     gMallocLeakZygoteChild;