Add Upscayl's "HFA2K" Model

[hollowaykeanho]

Description

Please provide a short description of what feature you're looking forward to
add into the existing repository below. Please include the story behind your
idea as well to give a better visualization of your idea.

Upscayl's team uploaded a new "HFA2K" model. Hence, let's patch it here.

Expected Behavior

Please specify the expected behavior of your requested feature. Some great and
helpful pointers are your expected interface (e.g. command patterns, simple
sketches of the user interface, etc).

Upscayl's HFA2K model is available.

Current Absent Behavior

Please specify the current behavior (e.g. workaround, blockage, etc).

Upscayl's HFA2K model is unavailable.

Attachment

Please drag and drop the necessary data files (e.g. screenshot, logs, etc)
below.

[hollowaykeanho]

Committed in bda2d137d500fb4e80e7d91cc89a33fa1fb05bc1