With the new DT checks the dts bindings for "nxp,flexpwm" and
"nxp,imx-pwm" had old conventions that we now treat as build errors.
Additionally fix the number of #pwm-cells for "nxp,imx-pwm" to be 1.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
i.MX RT10XX processors have four eFlexPWM modules, each containing
four 2-channels PWM submodules.
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>