While moving common used parts to dtsi files, the was disabled by
default but not enabled for all boards using the STP.
Fixes: f519fea4c6 ("lantiq: kernel 4.14: cleanup dts files")
Reported-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Mathias Kresin <dev@kresin.me>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>