Convert ModuleProvder to generic providers API

Convert all of the callers of ModuleProvider/ModuleHasProvider to use the
type-safe android.SingletonModuleProvider API.

Bug: 316410648
Test: builds
Change-Id: I6f11638546b64749e451cebbf33140248dc1d193

aconfig/exported_java_aconfig_library.go

@@ -30,10 +30,10 @@ func (this *exportedJavaDeclarationsLibrarySingleton) GenerateBuildActions(ctx a
 	// Find all of the aconfig_declarations modules
 	var cacheFiles android.Paths
 	ctx.VisitAllModules(func(module android.Module) {
-		if !ctx.ModuleHasProvider(module, DeclarationsProviderKey) {
+		decl, ok := android.SingletonModuleProvider(ctx, module, DeclarationsProviderKey)
+		if !ok {
 			return
 		}
-		decl := ctx.ModuleProvider(module, DeclarationsProviderKey).(DeclarationsProviderData)
 		cacheFiles = append(cacheFiles, decl.IntermediateCacheOutputPath)
 	})