ASoC: stm32: i2s: fix 16 bit format support

I2S supports 16 bits data in 32 channel length.
However the expected driver behavior, is to
set channel length to 16 bits when data format is 16 bits.
Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/stm/stm32_i2s.c

@@ -501,7 +501,7 @@ static int stm32_i2s_configure(struct snd_soc_dai *cpu_dai,
 	switch (format) {
 	case 16:
 		cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_16);
-		cfgr_mask = I2S_CGFR_DATLEN_MASK;
+		cfgr_mask = I2S_CGFR_DATLEN_MASK | I2S_CGFR_CHLEN;
 		break;
 	case 32:
 		cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_32) |