When creating mappings from DT both pin config and group config mappings
are allocated. Free them both when destroying the mappings.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: NJohn Crispin <blogic@openwrt.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>