staging/bcm: fix build for CONFIG_PM not enabled

Handle build case of CONFIG_PM not being enabled.

drivers/staging/bcm/InterfaceInit.c:280: error: 'struct usb_device' has no member named 'autosuspend_delay'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>