Audio Format: Improve sat_int24 function

- Added detailed function documentation.
- Changed from AE_SRAI32(AE_SLAI32S(x, 8), 8) to AE_SAT24S for
  more accurate 24-bit saturation.
- Used ae_f32x2 type to ensure correct input handling.
- No performance degradation observed.

This check-in enhances the sat_int24 function by improving its logic
and documentation to ensure more accurate 32-bit to 24-bit conversion.

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

src/include/sof/audio/format_hifi3.h

@@ -53,9 +53,23 @@ static inline ae_int32x2 vec_sat_int32x2(int64_t x, int64_t y)
 	/* Round and saturate both 64-bit values to 32-bit and pack them */
 	return (ae_int32x2)AE_ROUND32X2F64SSYM(d0, d1);
 }
+
+/**
+ * @brief Saturate and round a 32-bit integer to 24-bit.
+ *
+ * @param x 32-bit integer.
+ * @return 24-bit saturated integer.
+ *
+ * This function takes a 32-bit integer and saturates it to a 24-bit integer
+ * using saturating arithmetic instructions.
+ */
 static inline int32_t sat_int24(int32_t x)
 {
-	return AE_SRAI32(AE_SLAI32S(x, 8), 8);
+	/* Move 32-bit value to ae_f32x2 type */
+	ae_f32x2 d0 = AE_MOVDA32(x);
+
+	/* Saturate to 24-bit */
+	return (ae_int32)AE_SAT24S(d0);
 }
 
 static inline int16_t sat_int16(int32_t x)