ARM: pxa: spitz: use gpio descriptors for audio

[ Upstream commit 726d8c96 ]

The audio driver should not use a hardwired gpio number
from the header. Change it to use a lookup table.

Acked-by: Mark Brown <broonie@kernel.org>
Cc: alsa-devel@alsa-project.org
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Stable-dep-of: 78ab3d35 ("ARM: spitz: fix GPIO assignment for backlight")
Signed-off-by: Sasha Levin <sashal@kernel.org>