drivers: pinmux: stm32: remove pre-DT API

Remove APIs used in the pre-DT era. In case manual access is required,
`stm32_dt_pinctrl_configure` can still be used as a shortcut with data
initialized in the expected format.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
2 files changed