ARM: dts: bcm283x: Increase pwm-cells

The pwm-bcm2835 supports PWM polarity, so adjust the affected dtsi
files accordingly and fix the dtbs_check warning:

pwm@7e20c000: #pwm-cells:0:0: 3 was expected

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230617133620.53129-6-stefan.wahren@i2se.com


Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>