Add option to prepare the boot partition

[mlradu]

Add option to prepare the boot partition

Pull Request Description

The boot partition can be prepared with required boot files in order to boot a specific project on a specific board. The PROJECT_NAME and BOARD can be set in the config file. Project description is retrieved from kuiper.json. The configuration is done in 07.export-stage/03.export-image. After built, Kuiper will be ready to boot with no additional configuration.

PR Type

• [ ] Bug fix (change that fixes an issue)
• [x] New feature (change that adds new functionality)
• [ ] Breaking change (has dependencies in other repos or will cause CI to fail)

PR Checklist

• [x] I have performed a self-review of the changes
• [x] I have commented my code, at least hard-to-understand parts
• [x] I have built Kuiper Linux image with the changes
• [x] I have tested new image in hardware, on relevant boards
• [x] I have signed off all commits from this PR
• [x] I have updated the documentation (wiki pages, ReadMe etc)

[SRaus]

Please replace what's under "Pull Request Description" title with your PR description.

[mlradu]

v2:

• update README.md
• change variable names to ADI_EVAL_BOARD and CARRIER
• handle errors when running 'dd' and 'cp'
• use 'jq' instead of 'sed'

[mlradu]

v3:

• switch to '-ne' (not equal) operator inside 'if' condition
• find 'intel' keyword using 'jq'
• split path extraction and copy in two lines
• update comments
• add verbosity to 'cp' and 'mv' commands