Add `aapt_include_all_resources`

The equivalent of Make's LOCAL_AAPT_INCLUDE_ALL_RESOURCES.

Test: build LatinIME with Soong
Change-Id: Ib76bea5f28e365b59fa9477b9bceabb84012ff8e
diff --git a/java/aar.go b/java/aar.go
index a06d191..3ab07cc 100644
--- a/java/aar.go
+++ b/java/aar.go
@@ -47,6 +47,10 @@
 	// flags passed to aapt when creating the apk
 	Aaptflags []string
 
+	// include all resource configurations, not just the product-configured
+	// ones.
+	Aapt_include_all_resources *bool
+
 	// list of directories relative to the Blueprints file containing assets.
 	// Defaults to "assets"
 	Asset_dirs []string