usb: cdc_acm: Use 2 instead of 4 for IN BULK endpoint
The highest endpoint number supported by the STM32F4xx USB device
controller is 3. Change the cdc_acm driver to use endpoint 2
instead of endpoint 4 so that it will work with this platform.
Change-Id: I4a3cd08f546a7fe01558528de0990156f642d93b
Signed-off-by:
Christer Weinigel <christer@weinigel.se>
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