Revert "Bluetooth: hci_qca: Add delay for wcn3990 stability"

This reverts commit cde9dde6.

The frame reassembly errors were root caused to a transient gpio issue.
The missing response was root caused to an issue with properly managing
RFR in the uart driver.  Addressing those root causes occurs outside of
hci_qca and eliminates the need for the 50ms delay, so remove it.
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/hci_qca.c

@@ -1155,10 +1155,8 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
 		host_set_baudrate(hu, speed);
 
 error:
-		if (qca_is_wcn399x(soc_type)) {
-			msleep(50);
+		if (qca_is_wcn399x(soc_type))
 			hci_uart_set_flow_control(hu, false);
-		}
 
 		if (soc_type == QCA_WCN3990) {
 			/* Wait for the controller to send the vendor event