Add the WebViewBootstrap module to the base system.

When the flag is enabled, add the module to the base system.

Bug: 318717084
Test: build with/without flag
Change-Id: Ifd8c7cc85c711786f491a76d452ad1cac18b655b
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 5f5f510..277223e 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -320,6 +320,11 @@
         com.android.nfcservices
 endif
 
+ifeq ($(RELEASE_USE_WEBVIEW_BOOTSTRAP_MODULE),true)
+    PRODUCT_PACKAGES += \
+        com.android.webview.bootstrap
+endif
+
 # VINTF data for system image
 PRODUCT_PACKAGES += \
     system_manifest.xml \