soong: Add tests for depending on disabled module

This will check if direct deps of android.Module type is "Enabled()".
Previously, this is checked only if a module calls VisitDeps*()
functions in GenerateAndroidBuildActions().

Most modules call VisitDeps*() in GenerateAndroidBuildActions(),
but some modules don't. For example, "apex" module calls
WalkDepsBlueprint() or VisitDirectDepsBlueprint() since it
exceptionally depends on non-android.Module modules.

Therefore, when an apex module depends on disabled(enabled:false) module,
build fails with panic, which is fixed by this change.

Test: m # runs soong tests
Change-Id: I81c5c148bbd51a253d2904690eb76ae7b6df1a0f

android/module.go

@@ -1038,6 +1038,13 @@ func (m *ModuleBase) GenerateBuildActions(blueprintCtx blueprint.ModuleContext)
 	}
 
 	if m.Enabled() {
+		// ensure all direct android.Module deps are enabled
+		ctx.VisitDirectDepsBlueprint(func(bm blueprint.Module) {
+			if _, ok := bm.(Module); ok {
+				ctx.validateAndroidModule(bm, ctx.baseModuleContext.strictVisitDeps)
+			}
+		})
+
 		notice := proptools.StringDefault(m.commonProperties.Notice, "NOTICE")
 		if module := SrcIsModule(notice); module != "" {
 			m.noticeFile = ctx.ExpandOptionalSource(&notice, "notice")