ASoC: mmp-sspa: Drop S20_3LE case

It does nothing, because the corresponding bit s not flipped on in .formats
and the audio SRAM DMA engine is not able to handle 20-bit transfers
anyway.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200511210134.1224532-3-lkundrak@v3.skSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/pxa/mmp-sspa.c

@@ -275,9 +275,6 @@ static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
 	case SNDRV_PCM_FORMAT_S16_LE:
 		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_16_BITS);
 		break;
-	case SNDRV_PCM_FORMAT_S20_3LE:
-		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_20_BITS);
-		break;
 	case SNDRV_PCM_FORMAT_S24_3LE:
 		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_24_BITS);
 		break;