usb: tweak CDC_IN_FRAME_INTERVAL for more bandwidth
#define CDC_DATA_MAX_PACKET_SIZE 64 /* Endpoint IN & OUT Packet size */
#define CDC_CMD_PACKET_SZE 8 /* Control Endpoint Packet size */
-#define CDC_IN_FRAME_INTERVAL 15 /* Number of frames between IN transfers */
+#define CDC_IN_FRAME_INTERVAL 2 /* Number of frames between IN transfers */
#define APP_RX_DATA_SIZE 2048 /* Total size of IN (outbound from FC) buffer: \
APP_RX_DATA_SIZE*8/MAX_BAUDARATE*1000 should be > CDC_IN_FRAME_INTERVAL */
#define APP_TX_DATA_SIZE 2048 /* total size of the OUT (inbound to FC) buffer */
