bc12: pi3usb9201: drop cycle with no effect
bc12: pi3usb9201: drop cycle with no effect

The pi3usb9201 task function starts by cycling through the ports but
setting a state only for one port, so the "for" here can just be removed.

BRANCH=none
BUG=none
TEST=zmake build bryra

Signed-off-by: Fabio Baltieri <1c55e39c05d9ab42261288cf330256b2af6ba179@google.com>
Change-Id: I1f9e187e95fd94afa814cd50e1a479b32078e13d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3661580
Reviewed-by: Tristan Honscheid <1e17951ff5ffc8afe254954c03de64afef62fe52@google.com>

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