Remove USB disconnect delay from Serial test

Remove the USB disconnect delay since there is no reason this is
needed. Failures which occur without this indicate a device or host
problem.

Author: c1728p9

TESTS/usb_device/serial/main.cpp

@@ -56,10 +56,6 @@
 #define SERIAL_LOOPBACK_REPS 100
 #define USB_RECONNECT_DELAY_MS 1
 
-// Additional delay necessary for Windows hosts
-// to handle the reconnect operation correctly.
-#define USB_DISCONNECT_DELAY_MS 1
-
 #define LINE_CODING_STRLEN 13 // 6 + 2 + 1 + 1 + 3 * comma
 
 #define USB_DEV_SN_LEN (32) // 32 hex digit UUID
@@ -283,7 +279,6 @@ void test_cdc_usb_reconnect()
     TEST_ASSERT_TRUE(usb_cdc.configured());
     TEST_ASSERT_TRUE(usb_cdc.ready());
 
-    wait_ms(USB_DISCONNECT_DELAY_MS);
     // Disconnect the USB device.
     usb_cdc.disconnect();
     TEST_ASSERT_FALSE(usb_cdc.configured());
@@ -305,7 +300,6 @@ void test_cdc_usb_reconnect()
     TEST_ASSERT_TRUE(usb_cdc.configured());
     TEST_ASSERT_TRUE(usb_cdc.ready());
 
-    wait_ms(USB_DISCONNECT_DELAY_MS);
     // Disconnect the USB device again.
     usb_cdc.disconnect();
     TEST_ASSERT_FALSE(usb_cdc.configured());
@@ -525,7 +519,6 @@ void test_serial_usb_reconnect()
     TEST_ASSERT_EQUAL_INT(0, usb_serial.readable());
 
     // Disconnect the USB device.
-    wait_ms(USB_DISCONNECT_DELAY_MS);
     usb_serial.disconnect();
     TEST_ASSERT_FALSE(usb_serial.configured());
     TEST_ASSERT_FALSE(usb_serial.connected());
@@ -552,7 +545,6 @@ void test_serial_usb_reconnect()
     TEST_ASSERT_EQUAL_INT(0, usb_serial.readable());
 
     // Disconnect the USB device again.
-    wait_ms(USB_DISCONNECT_DELAY_MS);
     usb_serial.disconnect();
     TEST_ASSERT_FALSE(usb_serial.configured());
     TEST_ASSERT_FALSE(usb_serial.connected());