Temporary add ld.config.txt build

Last generic ld.config.txt deprecation caused build error from
build_test build because of invalid ld.config.txt build target. To fix
this ld.config.txt build target should be enabled until
ld.config.vndklite.txt and ld.config.legacy.txt also become deprecated.

Bug: 138920271
Test: m ld.config.txt passed
Test: build_test passed
Change-Id: I7f45ee66d3ed70a1a698261e1e801a30729f592f
diff --git a/rootdir/Android.mk b/rootdir/Android.mk
index a814fb8..a705071 100644
--- a/rootdir/Android.mk
+++ b/rootdir/Android.mk
@@ -237,6 +237,9 @@
 
 # for VNDK enforced devices
 # This file will be replaced with dynamically generated one from system/linkerconfig
+LOCAL_MODULE_STEM := $(LOCAL_MODULE)
+LOCAL_SRC_FILES := etc/ld.config.txt
+include $(BUILD_PREBUILT)
 
 else ifeq ($(_enforce_vndk_lite_at_runtime),true)