tests: uart_basic_api: use generic CDC ACM shield

Remove CDC ACM UART devicetree and config overlay, and explicit
USB support initialization in favor of generic CDC ACM shield.
For console support via USB CDC ACM, this example is to be built
as follows:

west build -b reel_board
  tests/drivers/uart/uart_basic_api -- -DSHIELD=cdc_acm_console

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

tests/drivers/uart/uart_basic_api/overlay-usb.conf

@@ -63,7 +63,7 @@ void test_main(void)
 	uint32_t dtr = 0;
 
 	dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_console));
-	if (!device_is_ready(dev) || usb_enable(NULL)) {
+	if (!device_is_ready(dev)) {
 		return;
 	}
 

tests/drivers/uart/uart_basic_api/src/main.c

@@ -21,8 +21,7 @@ tests:
     integration_platforms:
       - mps2_an385
   drivers.uart.basic_api.cdc_acm:
-    extra_args: OVERLAY_CONFIG="overlay-usb.conf"
-                DTC_OVERLAY_FILE="usb.overlay"
+    extra_args: SHIELD="cdc_acm_console"
     tags: drivers usb
     filter: CONFIG_UART_CONSOLE
     depends_on: usb_device