shared/tinyusb: Avoid symbol clash on targets with external TinyUSB.

On targets that provide a reference TinyUSB implementation, like ESP32,
the SDK already defines and implements standard callback functions such
as tud_cdc_line_state_cb(). This causes a symbol clash when enabling
shared implementations like the MicroPython 1200 touch functionality.

To avoid this symbol clash, add an optional macro to allow ports to
use a different function name in the shared implementation.

Signed-off-by: Luca Burelli <l.burelli@arduino.cc>

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