Merge branch 'net-ipa-interconnect-improvements'

Alex Elder says:

====================
net: ipa: interconnect improvements

The main outcome of this series is to allow the number of
interconnects used by the IPA to differ from the three that
are implemented now.  With this series in place, any number
of interconnects can now be used, all specified in the
configuration data for a specific platform.

A few minor interconnect-related cleanups are implemented as well.
====================

Link: https://lore.kernel.org/r/20210115125050.20555-1-elder@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>