Introduce support for Pinctrl driver on NXP S32Z/E SoC's.
The NXP S32 pin controller is a singleton node responsible for
controlling the pin function selection and pin properties, based on the
pin node group approach. The pinmux configuration is encoded in a
32-bit value.
Each S32 SoC implementing Pinctrl must create a `pinctrl_soc.h` header
which define SoC-specific macros to initialize the pinctrl structure.
Signed-off-by: Manuel Arguelles <manuel.arguelles@nxp.com>
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