Documentation: devicetree: update bindings for coresight components

Update device tree binding information for CTIs, dummy devices, hw-events,
remote-ETMs, TPDA and TPDM devices.

Change-Id: Ic25f380e996f5c87eeed830dfafd66a83773ad0c
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>