ASoC: pcm512x: Add support for more data formats

Currently, pcm512x driver supports only I2S data format.
This commit adds RJ, LJ, DSP_A and DSP_B as well.

I don't expect regression WRT existing sound cards, because:

* default value in corresponding register of pcm512x codec is 0 ==  I2S
* existing in-tree sound cards with pcm512x codec are configured for I2S
* i don't see how existing off-tree sound cards with pcm512x codec could be
  configured differently - it would not work
* tested explicitly, that there is no regression with Raspberry Pi +
  sound card `sound/soc/bcm/hifiberry_dacplus.c`

Signed-off-by: Kirill Marinushkin <kmarinushkin@birdec.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Matthias Reichl <hias@horus.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20201115122306.18164-5-kmarinushkin@birdec.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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