ARM: OMAP1: ams-delta: Provide GPIO lookup table for LED device

Global GPIO numbers no longer have to be passed to leds-gpio driver,
replace their assignment with a lookup table.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>