arm64: dts: renesas: r8a77995: draak: enable PWM channel 0 and 1

This patch enables PWM channel 0 and 1 on the draak. Each channel
connects to LTC2644 for brightness control.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>