kukui: increase PD_POWER_SUPPLY_TURN_OFF_DELAY
kukui: increase PD_POWER_SUPPLY_TURN_OFF_DELAY

The default value (50ms) is not enough for kukui platform, increase it
to 250ms.

BUG=b:149808890
TEST=plug in usb hub, plug in power cable to the hub
     verify power role swap succeed.
BRANCH=kukui

Change-Id: I487f0aeea78f2fc5de9a7dcc4a9a38cb831944cf
Signed-off-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2102171
Reviewed-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>
Commit-Queue: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>
Tested-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

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