coresight: funnel: add support for duplicating funnel devices

Funnel devices are now capable of supporting multiple-input and
multiple-output configuration with in built hardware filtering
for TPDM devices. Add support for duplicating funnel devices in
order to leverage current amba framework for their programming.
Each set of input-output combination is treated as independent
funnel devices by amba framework.

Change-Id: Id005089cf753a05769715cf64e9000f4e8ce8857
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>