usb/cdc_acm : Unsupported functions return error code
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>
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