Remove Unnecessary Imports From west.yml

[GoldenBug]

Summary:

We currently import all modules imported from the Zephyr Aspeed repo.
However we don't need the vast majority of them and it only increases
repo size when cloning.

Test Plan:

Build clean repo.

Reviewers:

Subscribers:

Tasks:

Tags: common

[GoldenBug]

@rainlinWW I'm looking to reduce the module import size of the repo.

Can you verify that the build still works for you as well when we are only importing cmsis?
Are you aware of any other imports that we require?

[rainlin024]

Hi @GoldenBug
Currently we only import cmsis and kernel from Aspeed repo.
Tested git clone openbic and fixing west.yml file as this commit, then did west update, applied patches and west build.

Before fixing west.yml:
$ du -sh zephyrproject/
3.9G zephyrproject/
build code: Pass
basic feature test: Pass

After fixing west.yml:
$ du -sh zephyrproject/
767M zephyrproject/
build code: Pass
basic feature test: Pass

Everything works well and code base size is reduced significantly.
This change looks good on our side.

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