npcx: Fixed bug which only handles VW event of SUS_WARN# in rising edge.
npcx: Fixed bug which only handles VW event of SUS_WARN# in rising edge.

During removing primary power of CPU, EC also needs to handle VW event
of SUS_WARN# in espi driver. Modify the MIWU trigger mode of it from
EDGE_RISING to EDGE_ANYING to solve it.

Modified sources:
1. espi.c: Handling VW event of SUS_WARN# in both edge.

BRANCH=none
BUG=chrome-os-partner:34346
TEST=make BOARD=wheatley; test power sequence on espi POC of wheatley.

Change-Id: I9e45115f3c274d08cdc694911d38599bc8da70c5
Signed-off-by: Mulin Chao <6bbc5af053a1dfdc363be6857f30de4ac3bcbd16@nuvoton.com>
Reviewed-on: https://chromium-review.googlesource.com/377780
Reviewed-by: CH Lin <49997681dc186e71092740314bf6c6feeca6e227@nuvoton.com>
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec