kohaku: Make PP5000_A_PGOOD a power signal interrupt
kohaku: Make PP5000_A_PGOOD a power signal interrupt

This signal is of the power signals, but it had been set as just a
GPIO_INPPUT. This CL corrects and makes in a interrupt signal similar
to the other power sequencing signals.

BUG=b:129372306
BRANCH=none
TEST=make -j BOARD=kohaku

Change-Id: Icc2e35292ba397ae13c0dc3d578bb9ddb1c99035
Signed-off-by: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1579901
Commit-Ready: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@chromium.org>
Tested-by: Scott Collyer <7d40b3eb9e17bf55d972074a5e77a7ea4159f9dd@chromium.org>
Reviewed-by: Furquan Shaikh <6be5c96c464778f89679b1062a2e0a6af93d2aa5@chromium.org>

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