ARM: omap1: Fix new user of gpiochip_request_own_desc()

This fixes up a new user of gpiochip_request_own_desc() in
the AMS Delta board that appeared after the patch that was
applied recently.

Fixes: 21abf103

 ("gpio: Pass a flag to gpiochip_request_own_desc()")
Reviewed-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>