STM32F3 - enable USB_DEVICE for NUCLEO_F303ZE

[jeromecoutant]

Summary of changes

Hi
I definitively need some USB expertise..,
but I could make USB working with NUCLEO_F303ZE

target	platform_name	test suite	result	elapsed_time (sec)	copy_method
NUCLEO_F303ZE-ARMC6	NUCLEO_F303ZE	drivers-usb-tests-tests-usb_device-hid	OK	23.08	default
NUCLEO_F303ZE-ARMC6	NUCLEO_F303ZE	drivers-usb-tests-tests-usb_device-msd	OK	17.92	default
NUCLEO_F303ZE-ARMC6	NUCLEO_F303ZE	drivers-usb-tests-tests-usb_device-serial	OK	39.92	default

Impact of changes

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

[] 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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[ciarmcom]

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

[mbed-ci]

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