Remove CTS_SPI_FLAGS_TAG_ENB. Nobody is using it and at least one author can't remember why it was there.
Remove CTS_SPI_FLAGS_TAG_ENB. Nobody is using it and at least one
author can't remember why it was there.

The CTS_SCSI_FLAGS_TAG_ENB remains in place, and makes sense, and is
checked all over the place.

The CTS_SPI_FLAGS_TAG_ENB was probably an attempt to distinguish
protocol and transport tag capabilities. At the very least this can
be confusing and prone to many bugs, so let's just assume that the
transport tag case just flows from the protocol (and vice versa)
for now.

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