arm64: dts: freescale: imx8-ss-lsio: Fix #pwm-cells

stable inclusion
from stable-v6.6.7
commit 8b2c35e5e678a005f942c77cece9a5168662616d
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8SSQ4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8b2c35e5e678a005f942c77cece9a5168662616d



--------------------------------

[ Upstream commit d863a2f4f47560d71447650822857fc3d2aea715 ]

i.MX8QM/QXP supports inverted PWM output, thus #pwm-cells needs to be set
to 3.

Fixes: 23fa99b2 ("arm64: dts: freescale: imx8-ss-lsio: add support for lsio_pwm0-3")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>