pwm: imx: support output polarity inversion

[Lothar WaÃmann]

This patch series adds support for polarity inversion to the pwm-imx
driver. 

Changes wrt. v2:
- make the use of '#pwm-cells = <3>' optional, so that the change does
  not break existing DT blobs as suggested by Arnd Bergmann and Sascha
  Hauer.

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