usb: make the maximum number of interfaces and endpoints as configuration parameters

usb: make the maximum number of interfaces and endpoints as configuration parameters

Allow to change the maximum number of supported interfaces and endpoints
per device from the wizard.

These options can be useful to create custom USB devices without
changing internal BeRTOS components.

If only the standard USB devices already supported by BeRTOS are used
there's no need to change such options, and the default behaviour is to
auto-detect these values and evaluate them at compile-time, according to
the selected drivers.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4685 38d2e660-2303-0410-9eaa-f027e97ec537