usb: cdc_acm: Set bInterfaceProtocol to No Protocol (0)
usb: cdc_acm: Set bInterfaceProtocol to No Protocol (0)

Do not set protocol in interface descriptor. Although this field has
been ignored by major OSs during the last decades, this creates a big
deal of problems with ModemManager sending unexpected AT commands when
plugging in a dev board.

Fixes: #6646

Signed-off-by: Andrei Emeltchenko <a6565233ddc88e4fb9c66c1d70743223493f2ed4@intel.com>

zephyriot/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,punitvara/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,zephyriot/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,nashif/zephyr,punitvara/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,zephyriot/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,galak/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,nashif/zephyr,finikorg/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,ldts/zephyr,explora26/zephyr,finikorg/zephyr,galak/zephyr,Vudentz/zephyr,finikorg/zephyr,punitvara/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,Vudentz/zephyr,explora26/zephyr,explora26/zephyr,punitvara/zephyr,Vudentz/zephyr,mbolivar/zephyr,ldts/zephyr,kraj/zephyr,mbolivar/zephyr,finikorg/zephyr,zephyriot/zephyr,ldts/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,kraj/zephyr,ldts/zephyr