[usbdev] Don't re-initialize UART in Test

Signed-off-by: Sam Elliott <selliott@lowrisc.org>

sw/device/tests/usbdev_test.c

diff --git a/sw/device/tests/usbdev_test.c b/sw/device/tests/usbdev_test.c
index 563e1f8..da15fcf 100644
--- a/sw/device/tests/usbdev_test.c
+++ b/sw/device/tests/usbdev_test.c
@@ -84,9 +84,6 @@
         "This test is not expected to run on platforms other than the "
         "Verilator simulation. It needs the USB DPI model.");
 
-  uart_init(kUartBaudrate);
-  base_set_stdout(uart_stdout);
-
   LOG_INFO("Running USBDEV test");
 
   // Call `usbdev_init` here so that DPI will not start until the