watchdog: renesas-wdt: Remove R-Car M2-W ES2.x from blacklist

System restart triggered by watchdog time-out works fine on a Koelsch
board with R-Car M2-W ES2.0.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>