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pbb: led pwms: Add 'pwm-always-on' option, removed delay when enable the led

Jonas Höppner requested to merge pbb-led-pwm-always-on-PBB-41 into linux-5.10.52-seco

When the led brightness is changed from 0->1 the pwm needs to be enabled. This clock-enabling introduces a delay from about 1ms. With the new devicetree property the pwm is left enabled also in the 0 brightness state of the led/pwm. This removes the delay.

Closes PBB-41

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