Let's document that we now support specifying path tag information in the
arg cells of the 'interconnects' DT property. This information would be
populated when the xlate_extended() callback is used.

Specifying the tag in DT will allow the interconnect framework to do the
aggregation based on the tag automatically. The users can still use the
icc_set_tag() API if/when needed.
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200903133134.17201-3-georgi.djakov@linaro.orgSigned-off-by: Georgi Djakov <georgi.djakov@linaro.org>