[PATCHES v2] bsps/imxrt: Support GPIO CS for LPSPI; Minor fix for imxrt1166

[Christian Mauderer]

Hello,

I noted some minor bugs in the first version of the patches while using
them. So here is a second version.

That are BSP specific patches and I now used the driver in this
configuration for some time and found no further problems. So if no one
objects, I will push the patches in a few days.

Best regards

Christian