samples: wifi: wfa_qt_app: Fix a SoF crash

When WPA supplicant debug logs are enabled along with log mode immediate
we see a crash overflow in "usb_workq", double the stack size to
accomodate these, as we have enough memory in this sample we do this for
non-debug case too.

Signed-off-by: Chaitanya Tata <[email protected]>

Author: krish2718

samples/wifi/wfa_qt_app/overlay-netusb.conf

@@ -11,3 +11,4 @@ CONFIG_USB_DEVICE_LOG_LEVEL_INF=y
 CONFIG_NET_IF_MAX_IPV4_COUNT=2
 CONFIG_NET_IF_UNICAST_IPV4_ADDR_COUNT=2
 CONFIG_NET_CONFIG_USB_IPV4_ADDR="192.0.2.1"
+CONFIG_USB_NRFX_WORK_QUEUE_STACK_SIZE=2048