mkrofs: tool to create Read Only File System image

[gerard5]

Introducing tool to create Read-Only File System image.

Filesystem can be created as little or big endian, server supports target native endianness.

Usage: mkrofs [-p depth] [-l/-b] -d <dst> -s <src>
    Create Read-Only File System image
Where:
    -p <depth> - Optional recursion MAX_DEPTH, default=128
    -l         - Little endian FS, default
    -b         - Big endian FS
    -d <dst>   - Destination file system image file name (required)
    -s <src>   - Source root directory to be placed into dst (required)

JIRA: NIL-489

Description

Motivation and Context

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (refactoring, style fixes, git/CI config, submodule management, no code logic changes)

How Has This Been Tested?

• [ ] Already covered by automatic testing.
• [ ] New test added: (add PR link here).
• [ ] Tested by hand on: (list targets here).

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing linter checks and tests passed.
• [ ] My changes generate no new compilation warnings for any of the targets.

Special treatment

• [ ] This PR needs additional PRs to work (list the PRs, preferably in merge-order).
• [ ] I will merge this PR by myself when appropriate.