SPI: IMX5/6: Set inactive state of SPI clock (SCLK CTL) according to SPI clock polarity

For our SPI device we need a SPI clock with active low polarity and a a high inactive state.

We add the setting of the inactive state ECSPIx_CONFIGREG:SCLK CTL according to the clock polarity ECSPIx_CONFIGREG:SCLK POL:

Device tree _without_ "spi-cpol" = 0 = clock active high polarity = inactive state low
Device tree with "spi-cpol" = 1 = clock active low polarity = inactive state high

Are there real world examples for a need of an individual setting of clock polarity/inactive state?

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