Increase SPI stack size to 2048 for BlueNrg driver

[tymoteuszblochmobica]

Summary of changes

In case of BlueNrg use there is need to increase SPI stack size to avoid system crash due to insufficient available memory.

Impact of changes

This change has no impact

Migration actions required

Not needed

Documentation

None

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

@pan-
@ATmobica

[ciarmcom]

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

[jeromecoutant]

@ARMmbed/team-st-ble

Pull request has been modified.

[0xc0170]

CI started

[mbed-ci]

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jenkins-ci/mbed-os-ci_unittests	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_cmake-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_cmake-cloud-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_greentea-test	✔️

[0xc0170]

I'll reopen in 3 minutes to trigger a new Travis run