Fix: duplicated definition of llndk_headers module

A llndk_headers module was double defined; one as a header lib and the
other as a static lib. Since llndk_headers is a header lib, the static
lib is now deleted.

Bug: 70617292
Test: build. (TestLlndkHeaders added)
Change-Id: I1a3e9d1a73616ea4faf03664a7a4b03bd5955629

cc/llndk_library.go

@@ -191,7 +191,6 @@ func (headers *llndkHeadersDecorator) Name(name string) string {
 func llndkHeadersFactory() android.Module {
 	module, library := NewLibrary(android.DeviceSupported)
 	library.HeaderOnly()
-	library.setStatic()
 
 	decorator := &llndkHeadersDecorator{
 		libraryDecorator: library,