drivers: pwm_nrfx: Treat `pwm` parameter as PWM channel, not SoC pin

Align with other PWM drivers and treat the `pwm` parameter (described
ambiguously as "PWM pin") of the `pwm_pin_set_cycles` function as a PWM
channel, not an SoC pin. This will also make the driver consistent with
the `pwm-cells` property definition in the "nordic,nrf-pwm" binding
and with related `DT_PWMS_*` macros.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>