QSPIF: Add missing mbed namespace prefix to header file

[Uruloke]

Summary of changes

If compiling mbed-os with the directive MBED_NO_GLOBAL_USING_DIRECTIVE and including the QSPIF component the compiler will complain about missing/incomplete types bd_addr_t and bd_size_t. These types are defined in BlockDevice.h in the mbed namespace but the QSPIFBlockDevice.h does not prefix the types with mbed::.

This pull request adds the mbed namespace prefix to two instances where it seems to have been forgotten.

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)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

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

[0xc0170]

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[mbed-ci]

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