ARMmbed / mbed-os / 21370

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travis-ci

tools, NRF51-post-build: Use paths to hex files

### Description

The NRF51 post build hook finds it's hex files using the Resources
object. This PR fixes the corner case where the hex files within a
project have a name!=path (This really only happens online).

### Pull request type

    [x] Fix
    [ ] Refactor
    [ ] Target update
    [ ] Functionality change
    [ ] Breaking change

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