UPSTREAM: interconnect: Move internal structs into a separate file

Move the interconnect framework internal structs into a separate file,
so that it can be included and used by ftrace code. This will allow us
to expose some more useful information in the traces.

Bug: 151255205
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
(cherry picked from commit dd018a9cf9108f9c7d924f6fe09aed745e78a67e)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I913023038160d36c75dec1d04c89cd4671977321