Revert "Make the enabled property configurable"

Revert submission 27162921-configurable_enabled_property

Reason for revert: Droid-monitor created revert due to Build breakage in b/338253720. Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:27162921-configurable_enabled_property

Change-Id: I2d144f9d297373a13a1190b173d10c966181ad84
diff --git a/android/variable.go b/android/variable.go
index 309824f..599f88e 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 proptools.Configurable[bool] `android:"arch_variant,replace_instead_of_append"`
+			Enabled *bool `android:"arch_variant"`
 		} `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 proptools.Configurable[bool] `android:"arch_variant,replace_instead_of_append"`
+			Enabled *bool `android:"arch_variant"`
 		} `android:"arch_variant"`
 
 		Malloc_not_svelte struct {