Incorrect render of meshes with indexed normals

[cpichard]

Describe the bug
Since the commit 60e6676 the meshed with indexed normals are not rendered correctly.
Here is a test scene that shows the issue :
test.usd_rop1.usd.zip

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-15918

[cpichard]

The problem is visible only when using husk.