arm64: dts: renesas: r8a779a0: Add ISP core function block

arm64: dts: renesas: r8a779a0: Add ISP core function block

All ISP instances on V3U have both a channel select and core function
block, describe the core region in addition to the existing cs region.

The interrupt number already described intended to reflect the cs
function but did incorrectly describe the core block. This was not
noticed until now as the driver do not make use of the interrupt for the
cs block.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250423163113.2961049-3-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>