Revert "Revert "Load default prop from /system/etc/prop.default""

This reverts commit 98a73a2ce10df46bc8d095413b415e284206836b.

Bug: 37815285
Bug: 62525809
Test: Tested with ag/2398663 and ag/2400524. Booted pixel phones,
      checked the location of pro.default, verified the symlink
      at /default.prop, checked a few properties via adb shell and
      manually tested a few apps.
      Booted to recovery mode and ran 'adb sideload' successfully.
Change-Id: I407412a7002b898ffb352cb5f331cab9c15be39a
diff --git a/libcutils/fs_config.c b/libcutils/fs_config.c
index d98a923..5b9d174 100644
--- a/libcutils/fs_config.c
+++ b/libcutils/fs_config.c
@@ -135,7 +135,8 @@
     { 00640, AID_ROOT,      AID_SHELL,     0, "data/nativetest64/tests.txt" },
     { 00750, AID_ROOT,      AID_SHELL,     0, "data/nativetest/*" },
     { 00750, AID_ROOT,      AID_SHELL,     0, "data/nativetest64/*" },
-    { 00600, AID_ROOT,      AID_ROOT,      0, "default.prop" },
+    { 00600, AID_ROOT,      AID_ROOT,      0, "default.prop" }, // legacy
+    { 00600, AID_ROOT,      AID_ROOT,      0, "system/etc/prop.default" },
     { 00600, AID_ROOT,      AID_ROOT,      0, "odm/build.prop" },
     { 00600, AID_ROOT,      AID_ROOT,      0, "odm/default.prop" },
     { 00444, AID_ROOT,      AID_ROOT,      0, odm_conf_dir + 1 },