dts: bindings: add missing pinctrl-device.yaml includes

These worked because edtlib allows 'pinctrl-.*' properties without
specifying them on the bindings. However, this has never been an
anounced pinctrl feature, the reference documents explicitly mention
that usage of pinctrl-device.yaml is mandatory.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>