Artyom Skrobov 4e3c1d4a4c [build] Allow USB to be set to 0
Unify USB-related makefile var and C def as CIRCUITPY_USB.

Always define it as 0 or 1, same as all other settings.

USB_AVAILABLE was conditionally defined in supervisor.mk,
but never actually used to #ifdef USB-related code.

Loosely related to #4546
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