soc: npcx: add soc drivers for npcx9 series.

This CL adds the soc drivers for npcx9 series. There are two soc part
numbers, npcx9m3f and npcx9m6f, are introduced. We also move soc family
configurations from /nuvoton_npcx/npcx7/Kconfig.soc to
nuvoton_npcx/Kconfig.

Signed-off-by: Jun Lin <CHLin56@nuvoton.com>
Signed-off-by: Mulin Chao <mlchao@nuvoton.com>