Replace ndk_libs.bzl with an attr in cc_stub_suite

(This CL is a cleanup, and should be a no-op)

Currently we support three variations of cc api stubs.
1. publicapi stubs, i.e. ndk stubs (empty additional args to ndkstubgen)
2. module-libapi stubs that are also an ndk library (--systemapi --apex)
3. module-libapi stubs that are not an ndk library (--systemapi --apex
   --no-ndk)

ndk_libs.bzl was used to differentiate between (2) and (3). This creates
an additional layer of indirection - users will need to modify this
external .bzl file if they would like to add a library to an ndk.

Replace this with an explicit atttibute in cc_stub_suite macro for better UX.

Test: go test ./bp2build
Test: b test //build/bazel/rules/cc:cc_stub_library_tests (added in
sibling CL)
Bug: 299501496

Change-Id: Idd3579e8013bae7a1740534f90d2767df5bac1a5
diff --git a/cc/ndk_library.go b/cc/ndk_library.go
index 4936559..df775de 100644
--- a/cc/ndk_library.go
+++ b/cc/ndk_library.go
@@ -594,9 +594,10 @@
 	symbolFileLabel := android.BazelLabelForModuleSrcSingle(ctx, proptools.String(ndk.properties.Symbol_file))
 	attrs := &bazelCcStubSuiteAttributes{
 		// TODO - b/300504837 Add ndk headers
-		Symbol_file: proptools.StringPtr(symbolFileLabel.Label),
-		Soname:      proptools.StringPtr(sourceLibraryName + ".so"),
-		Api_surface: proptools.StringPtr(android.PublicApi.String()),
+		Symbol_file:     proptools.StringPtr(symbolFileLabel.Label),
+		Soname:          proptools.StringPtr(sourceLibraryName + ".so"),
+		Api_surface:     proptools.StringPtr(android.PublicApi.String()),
+		Included_in_ndk: proptools.BoolPtr(true),
 	}
 	if sourceLibrary, exists := ctx.ModuleFromName(sourceLibraryName); exists {
 		// the source library might not exist in minimal/unbuildable branches like kernel-build-tools.