Tests: USB: Add device config files for Zadig

Zadig is a tool used to install generic USB drivers on Windows machines.
These drivers are necessary to run USB device test suite on Windows
hosts.

Author: fkjagodzinski

TESTS/usb_device/basic/zadig_conf/README.md

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+# Generic USB driver installation on Windows machines
+
+In order to run the Mbed OS USB device test suite (`tests-usb_device-*`)
+on Windows hosts you need to install generic USB drivers for two test devices.
+
+1. Download *Zadig* application from https://zadig.akeo.ie/.
+1. Unplug the Mbed device.
+1. Open *Zadig*.
+1. Select *Device -> Load Preset Device*.
+1. Open `mbed_os-usb_test_device1.cfg`.
+1. Choose `libusb-win32 (v1.2.6.0)` driver.
+1. Select `Install Driver` and click it.
+1. Select *Device -> Load Preset Device*.
+1. Open `mbed_os-usb_test_device2.cfg`.
+1. Choose `libusb-win32 (v1.2.6.0)` driver.
+1. Select `Install Driver` and click it.
+1. Close *Zadig*.
+1. Plug both device USB interfaces (*DAPLink* and *USB device*).

TESTS/usb_device/basic/zadig_conf/mbed_os-usb_test_device1.cfg

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+# Zadig device configuration
+# Mbed OS USB test device -- basic tests
+[device]
+Description = "MBED TEST DEVICE"
+VID = 0x0D28
+PID = 0x0205

TESTS/usb_device/basic/zadig_conf/mbed_os-usb_test_device2.cfg

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+# Zadig device configuration
+# Mbed OS USB test device -- endpoint tests
+[device]
+Description = "USB DEVICE"
+VID = 0x0D28
+PID = 0x0206