[usb_telemetry] Cleaned up working commit
Works with fixedwing and rotorcraft for both F1 and F4 chips.

Changes:
* VCOM_poll() changed to VCOM_event()
* main.c formating restored back to original
* removed Alternate function for pin 9 (USB_VBUS) as it wasn;t necessary
* USB ID set to correct values (both STM32 and LPC variants)
* Device descriptor strings changed to proper values (both STM32 and LPC)