Embed HNI in hhbbc_test

Summary: No HNI is loaded in hhbbc_test. This is blocking D1668045, and potentially other conversions to HNI.

Reviewed By: @markw65

Differential Revision: D1705542

Signature: t1:1705542:1417028326:f40af9af166e91e5c1501dab2293eb1537378d60