kakadu: update led pwm duty
kakadu: update led pwm duty

Set led pwm duty to max to get full brightness.

BUG=b:152719659
BRANCH=kukui
TEST=make -j BOARD=kakadu
TEST=make buildall
TEST=Check LED on kakadu.

Signed-off-by: Scott Chao <6950ee624d598d0adc71b6d04ae8e78bd704b32f@bitland.corp-partner.google.com>
Change-Id: I1f401580a463d3d6afeb68ce4f085bba3481f319
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2167121
Reviewed-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

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