Make the enabled property configurable

This allows using select statements with it.

Bug: 323382414
Test: m nothing --no-skip-soong-tests
Change-Id: I6f3efaaa3d82505e38a91ee4ba0e18e404360191
Merged-In: If355d24506e3f117d27b21442a6c02bca3402dc7
diff --git a/android/variable.go b/android/variable.go
index 599f88e..309824f 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -58,13 +58,13 @@
 		// unbundled_build is a catch-all property to annotate modules that don't build in one or
 		// more unbundled branches, usually due to dependencies missing from the manifest.
 		Unbundled_build struct {
-			Enabled *bool `android:"arch_variant"`
+			Enabled proptools.Configurable[bool] `android:"arch_variant,replace_instead_of_append"`
 		} `android:"arch_variant"`
 
 		// similar to `Unbundled_build`, but `Always_use_prebuilt_sdks` means that it uses prebuilt
 		// sdk specifically.
 		Always_use_prebuilt_sdks struct {
-			Enabled *bool `android:"arch_variant"`
+			Enabled proptools.Configurable[bool] `android:"arch_variant,replace_instead_of_append"`
 		} `android:"arch_variant"`
 
 		Malloc_not_svelte struct {