bp2build: add allowlist for package-level conversions.

This CL adds the support for specifying lists of directories in
build/soong/android/bazel.go, which are then written into
out/soong/bp2build/MANIFEST. Using this configuration,
modules/directories can either default to bp2build_available: true or
false, while still retaining the ability to opt-in or out at the module level.

It also ensures that ConvertWithBp2Build returns true iff the module
type has a registered bp2build converter.

Test: go tests
Test: demo.sh full
Test: TreeHugger presubmits for bp2build and mixed builds.

Change-Id: I0e0f6f4b1b2ec045f2f1c338f7084defc5d23a55
diff --git a/genrule/genrule.go b/genrule/genrule.go
index b43f28e..cb841ed 100644
--- a/genrule/genrule.go
+++ b/genrule/genrule.go
@@ -820,7 +820,7 @@
 
 func GenruleBp2Build(ctx android.TopDownMutatorContext) {
 	m, ok := ctx.Module().(*Module)
-	if !ok || !m.ConvertWithBp2build() {
+	if !ok || !m.ConvertWithBp2build(ctx) {
 		return
 	}