Audio: SRC: Use valid_bit_depth to select processing function

The check of cd->ipc_config.base.audio_fmt.depth results to
select S32_LE format processing function for SRC when the format
is S24_LE. The check need to be done for valid_bit_depth instead.

The S32_LE function appears to work but any sample that exceeds
the range -2^23 .. +2^23-1 is overflow for S24_le. Also the use
of S24_LE processing core will improve the signal-to-noise ratio.

Reported-by: Tomasz Leman <tomasz.m.leman@intel.com>
Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

src/audio/src/src_ipc4.c

@@ -149,7 +149,7 @@ int src_prepare_general(struct processing_module *mod,
 	/* set align requirements */
 	src_set_alignment(source, sink);
 
-	switch (cd->ipc_config.base.audio_fmt.depth) {
+	switch (cd->ipc_config.base.audio_fmt.valid_bit_depth) {
 #if CONFIG_FORMAT_S16LE
 	case IPC4_DEPTH_16BIT:
 		cd->data_shift = 0;