lantiq: use more devm for i2c

lantiq: use more devm for i2c

i2c_add_numbered_adapter is the wrong function to use here. It requires
setting nr to some value, otherwise it behaves the same as
i2c_add_adapter. nr is not set.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/16825
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 44824f0b787b13e2f2fccc58256b2c42fa3f9f5d)
Link: https://github.com/openwrt/openwrt/pull/17097
Signed-off-by: Petr Štetiar <ynezz@true.cz>