Correct ZynqMP configuration to be appropriately named

Correct ZynqMP configuration to be appropriately named

The xilinx_ultrascale.cfg target is actually the configuration for a
ZynqMP, which is a combination of an UltraScale+ FPGA core and a quad
core A53. Update the filename/comments to reflect this, and include
the tap IDs for all known FPGA cores for this part.

Change-Id: I70dfcc99861a482b83b6a795e83021d9cf1fe047
Signed-off-by: Jonathan McDowell <noodles@earth.li>
Reviewed-on: http://openocd.zylin.com/4850
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>