usb: dwc2: Simplify a bitmap declaration

Use DECLARE_BITMAP() instead of hand writing it.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/a2bf604d26dbe9816fdaae0faf4b4837ecacc6d3.1640245180.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>