Add sdk_version property to imported jars

Test: m checkbuild
Change-Id: I83dd6ad157c7a5918747ce8c9be05c1e1e22d710
diff --git a/java/java.go b/java/java.go
index 0cd99eb..7fdf94e 100644
--- a/java/java.go
+++ b/java/java.go
@@ -913,6 +913,8 @@
 
 type ImportProperties struct {
 	Jars []string
+
+	Sdk_version string
 }
 
 type Import struct {