soc: nxp: s32: convert power mng to native drivers

Convert power management to native drivers retaining existing
functionalities. Presently only SoC reset support and power control
initialization is supported, but these drivers will be extended to
support power management as well.

MC_ME and MC_RGM peripherals are common enough to be reused by other NXP
S32 devices, whereas PMC has specific implementations for each SoC
series.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>