Fix bits vs bytes confusion in SWV.
Fix bits vs bytes confusion in SWV.

pyocd/pyOCD,mbedmicro/pyOCD,pyocd/pyOCD,flit/pyOCD,mesheven/pyOCD,mbedmicro/pyOCD,mbedmicro/pyOCD,flit/pyOCD,mesheven/pyOCD,mesheven/pyOCD