driver: clock_control: npcx: add support for npcx4 series

This CL introduces new clock architectures in npcx4 series and wraps
clock configurations of different series by device tree files.

For example, the PWDWN_CTLx reg initialization relies on `pwdwn-ctl-val`
prop of pcc DT node now.

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