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Poll functions were not implemented for the cdc_acm USB uart since the underlying USB device controller always uses interrupts. We return -ENOTSUP and 0 rather than leaving unimplemented. Jira: ZEP-595 Change-Id: I02d9e693694d03296da3c815cdda53f151e06f6d Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>