drivers: espi: npcx: add espi support for npck3

This commit adds eSPI support for npck3, including support for the
maximum frequency of 66MHz. The method to read the level of eSPI reset
pin differs on npck3, so the definition of eSPI_RST has been updated
accordingly.

Signed-off-by: Tom Chang <CHChang19@nuvoton.com>
Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
6 files changed