Bluetooth: hci_usb_h4: Add sample for USB_PID_BLE_HCI_H4_SAMPLE

This sample select CONFIG_USB_PID_BLE_HCI_H4_SAMPLE to use H4 over bulk
endpoints.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

samples/bluetooth/hci_usb_h4/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(hci_usb_h4)
+
+target_sources(app PRIVATE src/main.c)

samples/bluetooth/hci_usb_h4/Kconfig

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+# Copyright (c) 2019 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config USB_DEVICE_PID
+	default USB_PID_BLE_HCI_H4_SAMPLE
+
+source "Kconfig.zephyr"

samples/bluetooth/hci_usb_h4/README.rst

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+.. _bluetooth-hci-usb-h4-sample:
+
+Bluetooth: HCI H4 over USB
+##########################
+
+Overview
+********
+
+Make a USB H4 Bluetooth dongle out of Zephyr. Requires USB device support from
+the board it runs on (e.g. :ref:`nrf52840dk_nrf52840` supports both BLE and
+USB).
+
+Requirements
+************
+
+* Bluetooth stack running on the host (e.g. BlueZ)
+* A board with Bluetooth and USB support in Zephyr
+
+Building and Running
+********************
+This sample can be found under :zephyr_file:`samples/bluetooth/hci_usb_h4` in
+the Zephyr tree.
+
+See :ref:`bluetooth samples section <bluetooth-samples>` for details.

samples/bluetooth/hci_usb_h4/prj.conf

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+CONFIG_STDOUT_CONSOLE=y
+CONFIG_GPIO=y
+CONFIG_SERIAL=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+
+CONFIG_USB=y
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_BT_H4=y

samples/bluetooth/hci_usb_h4/sample.yaml

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+sample:
+  name: Bluetooth over USB sample
+tests:
+  sample.bluetooth.hci_usb_h4:
+    harness: bluetooth
+    depends_on: usb_device ble
+    tags: usb bluetooth
+    # FIXME: exclude due to build error
+    platform_exclude: 96b_carbon

samples/bluetooth/hci_usb_h4/src/main.c

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+/*
+ * Copyright (c) 2020 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <sys/printk.h>
+#include <usb/usb_device.h>
+
+void main(void)
+{
+	int ret;
+
+	ret = usb_enable(NULL);
+	if (ret != 0) {
+		printk("Failed to enable USB");
+		return;
+	}
+
+	printk("Bluetooth H:4 over USB sample\n");
+}