Remove ld.config.txt from bionic APEX

Dynamic linker will use generated linker configuration in general. As
ld.config.txt file in the APEX module will not be used, we can remove
this to avoid confusion.

Bug: 149887007
Test: m -j passed
Test: Boot succeeded from cuttlefish and walleye
Change-Id: Iffd2113cf29055a7263eb3697547297639e9dc0c

apex/Android.bp

@@ -14,13 +14,6 @@ apex_key {
     private_key: "com.android.runtime.pem",
 }
 
-prebuilt_etc {
-    name: "com.android.runtime.ld.config.txt",
-    src: "ld.config.txt",
-    filename: "ld.config.txt",
-    installable: false,
-}
-
 apex {
     name: "com.android.runtime",
     compile_multilib: "both",
@@ -38,7 +31,6 @@ apex {
             binaries: ["linker"],
         },
     },
-    prebuilts: ["com.android.runtime.ld.config.txt"],
     key: "com.android.runtime.key",
     certificate: ":com.android.runtime.certificate",
 }

apex/ld.config.txt

@@ -1,8 +0,0 @@
-# Copyright (C) 2019 The Android Open Source Project
-#
-# Bionic loader config file for the Runtime APEX. This is a minimal config to
-# make the linker able to load itself as an executable (it just needs to exist).
-
-dir.runtime = /apex/com.android.runtime/bin/
-
-[runtime]