samples: usb: webusb-next: failure to enumerate on lpcxpresso55s16 under MS Windows

[henrikbrixandersen]

Describe the bug
When running samples/subsys/usb/webusb-next/ on the lpcxpresso55s16/lpc55s16 board, it fails to enumerate on MS Windows, since the MSOSv2 descriptor cannot be read.

To Reproduce
Steps to reproduce the behavior:

1. west build -b lpcxpresso55s16/lpc55s16 samples/subsys/usb/webusb-next/
2. west flash
3. See error below when board is plugged into a PC running MS Windows

Expected behavior
USB enumeration completes.

Impact
Unable to use MSOSv2 descriptors.

Logs and console output

*** Booting Zephyr OS build v4.0.0-2624-g59c94db6f052 ***
[00:00:00.104,000] <inf> main: USBD message: Bus reset
[00:00:05.711,000] <inf> main: USBD message: Bus reset
[00:00:05.855,000] <err> usbd_core: UDC error event
[00:00:05.855,000] <inf> main: USBD message: Controller error
[00:00:10.878,000] <err> usbd_core: UDC error event
[00:00:10.878,000] <inf> main: USBD message: Controller error

Environment (please complete the following information):

• OS: MS Windows USB host
• Toolchain: Zephyr SDK 0.17.0
• Commit SHA: 59c94db

Additional context
When the MS Windows USB host attempts to read the MSOSv2 descriptor, the code eventually reaches

zephyr/drivers/usb/udc/udc_mcux_ip3511.c

Line 115 in 196fc5c

if (!udc_ep_is_busy(dev, cfg->addr)) {

where udc_ep_is_busy(dev, cfg->addr) returns true, causing udc_mcux_ep_feed() to return -EBUSY.

[henrikbrixandersen]

The same sample enumerates when running on the from_k64f board. Likely an issue specific to the udc_mcux_ip3511.c driver.