tcl/target: Add unified config for Renesas R-Car Gen2 targets

tcl/target: Add unified config for Renesas R-Car Gen2 targets

Add configuration for the Renesas R-Car Generation 2 targets.
These are SoCs with Cortex A15s and A7s. All cores currently
supported by OpenOCD are supported here as well as two new
cores, M2N and V2H, for the sake of support completeness.

Change-Id: Ib6fe70a91360b4f8bd69822ee28b6dea530cfa0a
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Reviewed-on: http://openocd.zylin.com/5397
Tested-by: jenkins
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>