USB: storage: e-mail update in drivers/usb/storage/unusual_devs.h

Updates the e-mail address of Phillip Potter, updater of the Nokia 6288
entry in drivers/usb/storage/unusual_devs.h

Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>