arm64: dts: rockchip: Drop interrupts property from rk3328 pwm-rockchip node

The binding doesn't define interrupts and adding such a definition was
refused because it's unclear how they should ever be used and the
relevant registers are outside the PWM range. So drop them fixing
several dtbs_check warnings.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/5551846d-62cd-4b72-94f4-07541e726c37@gmail.com


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