MAINTAINERS: usb: raw-gadget: add bug tracker link

Add a link to the GitHub repository where Raw Gadget issues are managed.

Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
Link: https://lore.kernel.org/r/20241012225853.118217-1-andrey.konovalov@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: xairy

MAINTAINERS

@@ -24076,6 +24076,7 @@ USB RAW GADGET DRIVER
 R:	Andrey Konovalov <andreyknvl@gmail.com>
 L:	linux-usb@vger.kernel.org
 S:	Maintained
+B:	https://github.com/xairy/raw-gadget/issues
 F:	Documentation/usb/raw-gadget.rst
 F:	drivers/usb/gadget/legacy/raw_gadget.c
 F:	include/uapi/linux/usb/raw_gadget.h