arm64: dts: rockchip: Change pwm pinctrl-name to "default" on rk356x

The pinctrl state "active" is neither documented nor used by the PWM
driver. Rename it to "default"

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20211208120312.3300390-1-s.hauer@pengutronix.de


Signed-off-by: Heiko Stuebner <heiko@sntech.de>