Update on "[ET-VK][ez] enabling fp64->fp32 converison for vulkan compatibility"

# Context

We need this conversion so that certain operators can handle floating point values that need to be 64bit. This is predominantly applicable to choose_qparams.tensor where it expects a 64bit output.

# Changes

Simply adding an additional conversion for float64 to vulkan fp32.

Differential Revision: [D77746137](https://our.internmc.facebook.com/intern/diff/D77746137/)

cc SS-JIA manuelcandales cbilgin

[ghstack-poisoned]

Author: morelos