Add configurable status register number in mbed_lib.json for QSPIBlockDevice driver to support different Flash EPN

[daniel-0723]

Summary of changes

For Mbed QSPIBlockDevice Driver, it hard-codes that the number of status register is 3 when detected the Macronix Flash. But for most of Macronix QSPI Flash, it only has 2 status register. So, we add a configurable parameter for QSPIBlockDevice driver in mbed_lib.json file, user can overwrite this parameter to configure the number of status register for specific Flash EPN.

Impact of changes

Add configurable status register number in mbed_lib.json

Migration actions required

Documentation

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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

[x] No Tests required for this change (E.g docs only update)
[] 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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[0xc0170]

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[mbed-ci]

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