tcl/target: Add support for Renesas R8A779A0 V3U SoC

tcl/target: Add support for Renesas R8A779A0 V3U SoC

The V3U SoC is unique in that it now has 8x CA76 and CR52,
while the previous SoCs had CA57/CA53/CR7 . This can still
be handled without too complex modifications to the gen3
configuration file, so add the logic to handle it there.

Change-Id: I7ab33eacc1fd379d369988d3d6690d2e82346c7e
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Reviewed-on: http://openocd.zylin.com/6314
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>