Reduce ST QSPI/OSPI trace verbosity to debug

[LDong-Arm]

Summary of changes

Replaces: #13804 (GitHub doesn't allow renaming a branch of an existing PR)

When mbed-trace is enabled, we may get traces from multiple software components. The chance that one needs to debug QSPI/OSPI is relatively low (compared to their own application/libraries), and those traces can significantly slow down QSPI/OSPI operations. Thus this PR reduces their verbosities from info to debug.

If a user wants to mute traces from those drivers completely, they can filter out specific trace groups in their application, e.g.

mbed_trace_exclude_filters_set("STOS");

Impact of changes

Traces from ST's QSPI/OSPI will be printed only if the trace level is set to debug.

Migration actions required

None.

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

@evedon @ARMmbed/team-st-mcd

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[0xc0170]

CI started

[mbed-ci]

Jenkins CI Test : ✔️ SUCCESS

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jobs	Status
jenkins-ci/mbed-os-ci_unittests	✔️
jenkins-ci/mbed-os-ci_cmake-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_dynamic-memory-usage	✔️
jenkins-ci/mbed-os-ci_cmake-example-test	✔️
jenkins-ci/mbed-os-ci_greentea-test	✔️
jenkins-ci/mbed-os-ci_cloud-client-pytest	✔️

[mergify]

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