interconnect: Print the tag in the debugfs summary

Now we can have a tag associated with the path. Add this information
to the interconnect_summary file, as the current information in debugfs
is incomplete.

Change-Id: If4629841e3899ea6176d86f5151340f4bacc1002
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Git-commit: 2c5127a7fa0369801e623e8c6e58193f86d31d73
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>