Some enhancements for the USBHost feature and small bug fix

[abougouffa]

Notes:

• Pull requests will not be accepted until the submitter has agreed to the contributer agreement.
• This is just a template, so feel free to use/remove the unnecessary things

Description

• Rewrite the USBHost module callbacks in the new form.
• Fix a bug related to defining MAX_HUB_NB macro, the variable k is declared if the macro is not zero as you can see here, and after, used without testing MAX_HUB_NB which leads to undefined reference error durring compilation if MAX_HUB_NB=0.

Status

READY

Migrations

If this PR changes any APIs or behaviors, give a short description of what API users should do when this PR is merged.

NO

Todos

• Tests
• Documentation (not needed)

Steps to test or reproduce

• Define the MAX_HUB_NB as zero leads to a compilation error.
• Compiling the USBHost leads to compilation warnings concerning the callbacks.

[mbed-ci]

Automatic CI verification build not done, please verify manually.

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 874
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5800/

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/morph uvisor-test
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Test : SUCCESS

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Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5800/721

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Exporter Build : SUCCESS

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[cmonr]

Double checking. @adbridge @0xc0170 shouldn't this PR target ARMmbed:master instead of ARMmbed:mbed-os-5.7 ?

[adbridge]

@cmonr Yes, we do not accept PRs against release branches...

[cmonr]

/morph build

[0xc0170]

Restarting CI, as it did not report back

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Build : SUCCESS

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Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5800/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build

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Exporter Build : FAILURE

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/morph uvisor-test

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Exporter Build : SUCCESS

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Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/5800/

[studavekar]

/morph test

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Test : SUCCESS

Build number : 741
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5800/741

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Exporter Build : FAILURE

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