Generate combined deps-info for all updatable modules.

Introduce a singleton apex rule to merge contents of individual
deps-info results into a single output file.

Bug: 149622332
Test: m
Change-Id: I4ab7e1a3527fead97a81a5a2cb0e1e93a429117c
Merged-In: I4ab7e1a3527fead97a81a5a2cb0e1e93a429117c
Exempt-From-Owner-Approval: cp from aosp
(cherry picked from commit 849f844252)

java/app.go

@@ -414,7 +414,7 @@ func (a *AndroidApp) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 }
 
 func (a *AndroidApp) checkAppSdkVersions(ctx android.ModuleContext) {
-	if Bool(a.appProperties.Updatable) {
+	if a.Updatable() {
 		if !a.sdkVersion().stable() {
 			ctx.PropertyErrorf("sdk_version", "Updatable apps must use stable SDKs, found %v", a.sdkVersion())
 		}
@@ -879,6 +879,10 @@ func (a *AndroidApp) buildAppDependencyInfo(ctx android.ModuleContext) {
 	a.ApexBundleDepsInfo.BuildDepsInfoLists(ctx, a.MinSdkVersion(), depsInfo)
 }
 
+func (a *AndroidApp) Updatable() bool {
+	return Bool(a.appProperties.Updatable) || a.ApexModuleBase.Updatable()
+}
+
 func (a *AndroidApp) getCertString(ctx android.BaseModuleContext) string {
 	certificate, overridden := ctx.DeviceConfig().OverrideCertificateFor(ctx.ModuleName())
 	if overridden {