Skip generating prebuilts entries for disabled modules

Change-Id: I5b17588789acb77bc5cfe2150a3a5decfd5bd01d
diff --git a/common/androidmk.go b/common/androidmk.go
index 9470b6b..7006bb9 100644
--- a/common/androidmk.go
+++ b/common/androidmk.go
@@ -185,6 +185,10 @@
 		amod := m.(AndroidModule).base()
 		data := provider.AndroidMk()
 
+		if !amod.Enabled() {
+			return
+		}
+
 		arch := amod.commonProperties.CompileArch
 
 		prefix := ""