Restore MTS_MDOT_F411RE bootloader binary

[theckmts]

Summary of changes

Restore MTS_MDOT_F411RE bootloader binary in tools to fix problems encountered with online compiler and mbed-os 5.x projects.

Fixes #13121

Impact of changes

Migration actions required

Documentation

None

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Pull request type

[X] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[X] Tests / results supplied as part of this PR

Tested by setting MBED_OS_DIR to point at the mbed-os on branch tools-release-6.0.0 with the bootloader binary in place (this branch has the restored post-build script for MDot). Another mbed-os directory at mbed-os-5.15.1 was used as source. Verified the bootloader is merged with the application and the CRC is applied.

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Reviewers

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[ciarmcom]

@theckmts, thank you for your changes.
@ARMmbed/mbed-os-tools @ARMmbed/mbed-os-maintainers please review.

[0xc0170]

@rwalton-arm Please review

[mbed-ci]

Test run: SUCCESS

Summary: 6 of 6 test jobs passed
Build number : 1
Build artifacts

[0xc0170]

Waiting on final review.