Implement system namespace for vendor process

For vendor process default namespace searches as following order:
1. /vendor/lib/(hw|egl), /vendor/lib: Vendor libs + VNDK-vnd-ext
2. /system/lib/vndk-$(ver): VNDK libs
3. /vendor/lib/vndk-sp-$(ver): VNDK-SP-vnd-ext
4. /system/lib/vndk-sp-$(ver): VNDK-SP
and searches system namespace (/system/lib) only for LL-NDK libs.
This configuarion is used only with BOARD_VNDK_VERSION is defined.

Bug: 37192038
Test: build with 'BOARD_VNDK_VERSION=current' and boot

Change-Id: If9778b9266a084846ba8fe73e6bff25828359d33
diff --git a/rootdir/Android.mk b/rootdir/Android.mk
index 046557e..07902fc 100644
--- a/rootdir/Android.mk
+++ b/rootdir/Android.mk
@@ -195,7 +195,15 @@
 
 LOCAL_MODULE := ld.config.txt
 ifeq ($(PRODUCT_FULL_TREBLE)|$(SANITIZE_TARGET),true|)
+ifdef BOARD_VNDK_VERSION
+  ifeq ($(BOARD_VNDK_RUNTIME_DISABLE),true)
+    LOCAL_SRC_FILES := etc/ld.config.txt
+  else
+    LOCAL_SRC_FILES := etc/ld.config.vndk.txt
+  endif
+else
 LOCAL_SRC_FILES := etc/ld.config.txt
+endif
 else
 LOCAL_SRC_FILES := etc/ld.config.legacy.txt
 endif