Qualcomm AI Engine Direct - Update arch and soc chipset terms (#6227)

Summary:
- Previously, we use the term arch_table and soc model interchangeably. However, these 2 terms referd to 2 different things. arch_table is now referred to htp arch table, which refers to htp architecture verison, such as v73, v75, etc. On the other hand, SoC model will be referring to the SoC chipsets ID, such as SM8550, SM8650, etc.
- Removed tutorial to add SoC. I don't think external users will be able to get SoC IDs.

Pull Request resolved: https://github.com/pytorch/executorch/pull/6227

Reviewed By: tarun292

Differential Revision: D64411771

Pulled By: cccclai

fbshipit-source-id: 1871b1df1633560be48eb80f62ac83382dd7164f