boot: zephyr: serial_adapter: Fail if USB CDC enabled with console and fail to build if main thread is not preemptible #1853
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This prevents MCUboot from successfully building if console and serial recovery (USB CDC) are both enabled and they both point to the same device. Also adds a build failure if the main thread priority is not preemptible and USB CDC ACM serial recovery is used, this is because if this is the case, USB events will never be able to be processed and serial recovery cannot ever enumerate