kblight: Don't leave kblight enable state undetermined
kblight: Don't leave kblight enable state undetermined

Keyboard backlight enabled state is undetermined after initialization.
Set kblight enabled state to off on initialization.

BUG=b:187757151
TEST=Guybrush kblight enable GPIO is deasserted on reboot
BRANCH=None

Signed-off-by: Rob Barnes <3ced0940a2329ce70499686f01d3d60685ec66ed@google.com>
Change-Id: Ia62c9f84c5593ac393808fac4f0373e831ccd5fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2888226
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>

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