UPSTREAM: interconnect: Add support for path tags

Consumers may have use cases with different bandwidth requirements based
on the system or driver state. The consumer driver can append a specific
tag to the path and pass this information to the interconnect platform
driver to do the aggregation based on this state.

Introduce icc_set_tag() function that will allow the consumers to append
an optional tag to each path. The aggregation of these tagged paths is
platform specific.

Reviewed-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
(cherry picked from commit 127ab2cc)
Bug: 140294226
Change-Id: I91fcd279e76ca0e7ea6eb0a60c77ea16750bdb3b
Signed-off-by: Tri Vo <trong@google.com>