Remove vr_hwc from GSI image.

Not all phones support the VR, so on phones
that don't, the inclusion of vr_hwc is causing
VtsHalGraphicsComposerV2_1Target failures.

Bug: 109913118
Test: vr_hwc is not on aosp_arm64_ab
Change-Id: I803b4dddc5a87e35875992ad9421c644698112f1