[fix] Update Macro variable

[shandianchengzi]

Pull Request

Summary of changes

Fixed a compilation error in QSPIFBlockDevice.cpp where MBED_CONF_QSPI_NUM_STATUS_REGISTER was incorrectly referenced instead of the correct configuration parameter MBED_CONF_QSPIF_QSPI_NUM_STATUS_REGISTER. This change replaces the incorrect macro with the proper one to resolve the build failure.

The error occurred during compilation:

/home/shandian/pure_experiments_env/examples/mbed-os-example-ble/BLE_Advertising/mbed-os/storage/blockdevice/COMPONENT_QSPIF/source/QSPIFBlockDevice.cpp:1096:37: error: 'MBED_CONF_QSPI_NUM_STATUS_REGISTER' was not declared in this scope; did you mean 'MBED_CONF_QSPIF_QSPI_NUM_STATUS_REGISTER'?
 1096 |             _num_status_registers = MBED_CONF_QSPI_NUM_STATUS_REGISTER;
      |                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                     MBED_CONF_QSPIF_QSPI_NUM_STATUS_REGISTER

Impact of changes

This change fixes a compilation error that prevented building applications using QSPIFBlockDevice with Macronix vendor quirks enabled. No functional impact on existing code as it simply corrects a configuration parameter reference.

Migration actions required

None. This is a simple bug fix that doesn't require any migration actions.

Documentation

None. This change only fixes a code error and doesn't require documentation updates.

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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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