coresight: funnel: add support for multiple output ports

Funnel devices are now capable of supporting multiple-input and
multiple-output configuration with in built hardware filtering
for TPDM devices. Add software support to this function. Output
ports is selected according to the source of the trace path.

Change-Id: Ieb635ca0650d66a84b8f5bc6e6f755927c6030c2
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>