dts: arm: npcx: Add PSL_IN3/4 for initial pin config

PSL_IN pin select register is Vsby power-up reset. When the other
core-domain-reset reset the chip, PSL_IN3/4 don't set to GPIO. This
commit adds PSL_IN3/4 to the pin select list in NPCX devicetree. So
these pins can be set to GPIO when the other core-domain-reset.

Signed-off-by: Wealian Liao <WHLIAO@nuvoton.com>