Refactor IonBuffer to use GraphicBuffer

- Replace gralloc0 based implementation with GraphicBuffer implementation.
- Removed incompatible ion-buffer unit-tests.
- Added libui dependencies to dependants.

Bug: 34879523
Test: Tested on Lucid, validated graphics and poses are working
Change-Id: I49a129f269d54c81bda93b44d879d4b8dee2006a
diff --git a/services/vr/bufferhubd/buffer_hub.cpp b/services/vr/bufferhubd/buffer_hub.cpp
index 0906476..80efcf8 100644
--- a/services/vr/bufferhubd/buffer_hub.cpp
+++ b/services/vr/bufferhubd/buffer_hub.cpp
@@ -29,7 +29,7 @@
 BufferHubService::~BufferHubService() {}
 
 bool BufferHubService::IsInitialized() const {
-  return BASE::IsInitialized() && IonBuffer::GetGrallocModule();
+  return BASE::IsInitialized();
 }
 
 std::string BufferHubService::DumpState(size_t /*max_length*/) {