kukui: remove duplicate items in i2c_ports array
kukui: remove duplicate items in i2c_ports array

i2c_ports[] should have one entry for each port, not for each i2c
slave

BUG=None
TEST=verify that `i2cscan` only scans port 0 and 1 once.
BRANCH=master

Change-Id: I457c780fabd7bb68a5dc8871236a080d2fc6f332
Signed-off-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1729097
Tested-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>
Reviewed-by: Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>
Commit-Queue: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

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