Update contexhub stub impl to V4

- Include actual implementation for getHubs()

Test: build
Bug: 361830233
Flag: N/A
Merged-In: Ib6b0d5628fb8f7c88c935e61093cf3f6a3dd0e65
Change-Id: Ib6b0d5628fb8f7c88c935e61093cf3f6a3dd0e65
4 files changed