USBPort: add the configuration interface

Add the configuration interface for USBPort based on Entity Manager
schema definition of [1].

[1]: https://gerrit.openbmc.org/c/openbmc/entity-manager/+/802

USBPort: add the configuration interface

Add the configuration interface for USBPort based on Entity Manager
schema definition of [1].

[1]: https://gerrit.openbmc.org/c/openbmc/entity-manager/+/80242

Tested: meson build passes.

Change-Id: If14c5f7127a6298df4372acb0f8db84d39ce95a2
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>

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