libdexfile_external is replaced by libdexfile (reland 2).

This relands https://r.android.com/1644045 after requisite fix in
https://r.android.com/1671709.

Test: atest CtsSimpleperfTestCases
Bug: 143978909
Change-Id: I89650a8059b56d2b35a5592ef555c91faa49a2cf
diff --git a/rootdir/etc/linker.config.json b/rootdir/etc/linker.config.json
index 83cb6ff..d9f5526 100644
--- a/rootdir/etc/linker.config.json
+++ b/rootdir/etc/linker.config.json
@@ -1,8 +1,7 @@
 {
   "requireLibs": [
-    // Keep in sync with the "platform" namespace in art/build/apex/ld.config.txt.
-    "libdexfile_external.so",
-    "libdexfiled_external.so",
+    "libdexfile.so",
+    "libdexfiled.so",
     "libnativebridge.so",
     "libnativehelper.so",
     "libnativeloader.so",