soc: nxp: mcx: add mcxe31 series soc

- create 'mcxe' as family and 'mcxe31x' as series
- add pinctrl_soc.h
- add soc.c/.h to do some soc level initialization
- add ecc initialization in mcxe31x_soc_initialization.S

Signed-off-by: Lucien Zhao <lucien.zhao@nxp.com>
13 files changed