Make required a configurable property

So that users can use select statements with it.

Fixes: 347605145
Bug: 342006386
Test: m nothing --no-skip-soong-tests
Change-Id: Ica0ca6d1725b000b3748c0293e5a9f9b38ed87f9
diff --git a/android/module.go b/android/module.go
index dc585d2..d629aa5 100644
--- a/android/module.go
+++ b/android/module.go
@@ -113,7 +113,7 @@
 	// Get information about the properties that can contain visibility rules.
 	visibilityProperties() []visibilityProperty
 
-	RequiredModuleNames() []string
+	RequiredModuleNames(ctx ConfigAndErrorContext) []string
 	HostRequiredModuleNames() []string
 	TargetRequiredModuleNames() []string
 
@@ -422,7 +422,7 @@
 	Vintf_fragments []string `android:"path"`
 
 	// names of other modules to install if this module is installed
-	Required []string `android:"arch_variant"`
+	Required proptools.Configurable[[]string] `android:"arch_variant"`
 
 	// names of other modules to install on host if this module is installed
 	Host_required []string `android:"arch_variant"`
@@ -1101,7 +1101,7 @@
 	hostTargets = append(hostTargets, ctx.Config().BuildOSCommonTarget)
 
 	if ctx.Device() {
-		for _, depName := range ctx.Module().RequiredModuleNames() {
+		for _, depName := range ctx.Module().RequiredModuleNames(ctx) {
 			for _, target := range deviceTargets {
 				addDep(target, depName)
 			}
@@ -1114,7 +1114,7 @@
 	}
 
 	if ctx.Host() {
-		for _, depName := range ctx.Module().RequiredModuleNames() {
+		for _, depName := range ctx.Module().RequiredModuleNames(ctx) {
 			for _, target := range hostTargets {
 				// When a host module requires another host module, don't make a
 				// dependency if they have different OSes (i.e. hostcross).
@@ -1619,8 +1619,8 @@
 	return m.base().commonProperties.ImageVariation == RecoveryVariation
 }
 
-func (m *ModuleBase) RequiredModuleNames() []string {
-	return m.base().commonProperties.Required
+func (m *ModuleBase) RequiredModuleNames(ctx ConfigAndErrorContext) []string {
+	return m.base().commonProperties.Required.GetOrDefault(m.ConfigurableEvaluator(ctx), nil)
 }
 
 func (m *ModuleBase) HostRequiredModuleNames() []string {
@@ -1992,7 +1992,7 @@
 			TargetDependencies: targetRequired,
 			HostDependencies:   hostRequired,
 			Data:               data,
-			Required:           m.RequiredModuleNames(),
+			Required:           m.RequiredModuleNames(ctx),
 		}
 		SetProvider(ctx, ModuleInfoJSONProvider, m.moduleInfoJSON)
 	}