Add native_bridge target to Android.bp

This allows us to build guest libraries for the native bridge for
arm/arm64 architectures.

Bug: http://b/77159578
Test: make
Change-Id: I35520ca456105ddadd456c78a4eb1e6de39147c5
diff --git a/android/module.go b/android/module.go
index e3c37bb..fb5c00a 100644
--- a/android/module.go
+++ b/android/module.go
@@ -290,6 +290,9 @@
 	// Whether this module is installed to recovery partition
 	Recovery *bool
 
+	// Whether this module is built for non-native architecures (also known as native bridge binary)
+	Native_bridge_supported *bool `android:"arch_variant"`
+
 	// init.rc files to be installed if this module is installed
 	Init_rc []string `android:"path"`