husk with Arnold drivers always renders float

[cpichard]

Describe the bug
This is the arnold-usd solaris bug referenced as HTOA-2284.

To Reproduce
Steps to reproduce the behavior:

1. Arnold Render Setting LOP
2. Add some AOVs (for example, RGBA, direct, indirect)
3. Change all AOVs to 16-bit
4. Enable Arnold Product Type
5. Render with husk
6. AOVs are all float

BTW, if I render with Direct USD Render, the RGBA is float, but the other AOVs are half

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-14491