ASoC: omap: Replace instances of rtd->codec->card with rtd->card

No need to go via the CODEC to get a pointer to the card. This will help to
eventually remove the card field from the snd_soc_codec struct.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --cc sound/soc/omap/omap-abe-twl6040.c
Simple merge

diff --cc sound/soc/omap/omap-twl4030.c
Simple merge

diff --cc sound/soc/omap/rx51.c
Simple merge