drivers/audio: change audio buffer size

change CONFIG_ALC1019_BUFFER_SIZE 2048 -> 16384

Commit is raised for RTL8730E rev 5 boards using ALC1019.
Commit is based on following previous commit raised for rev 6 and above versions using SYU645B.
Samsung@e26b55e

For more details, please refer to above commit.

os/drivers/audio/alc1019.c

@@ -52,7 +52,7 @@
  * It's good to match the buffer size with i2s DMA page size
  */
 #ifndef CONFIG_ALC1019_BUFFER_SIZE
-#define CONFIG_ALC1019_BUFFER_SIZE       2048
+#define CONFIG_ALC1019_BUFFER_SIZE       16384
 #endif
 
 #ifndef CONFIG_ALC1019_NUM_BUFFERS