Rename product_services to system_ext

Bug: 134359158
Test: build and check if system_ext.img is created
Change-Id: I67f2e95dd29eac6a28e07e24ea973d3a134c3bfc
diff --git a/core/install_jni_libs.mk b/core/install_jni_libs.mk
index 515d34f..0fec9ca 100644
--- a/core/install_jni_libs.mk
+++ b/core/install_jni_libs.mk
@@ -26,7 +26,7 @@
     $(TARGET_OUT_VENDOR)/% \
     $(TARGET_OUT_OEM)/% \
     $(TARGET_OUT_PRODUCT)/% \
-    $(TARGET_OUT_PRODUCT_SERVICES)/% \
+    $(TARGET_OUT_SYSTEM_EXT)/% \
 
 ifeq ($(filter $(supported_partition_patterns),$(my_module_path)),)
   my_embed_jni := true