pinctrl: nomadik: db8500: Add more detailed LCD groups

We need a more granular distribution among funcion A
and function B for the LCD pins for the Samsung
GT-I9070. Provide some new pin groups so we can
configure this phone properly.

Link: https://lore.kernel.org/r/20201110232330.2242167-1-linus.walleij@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>