MFC 225079:

MFC 225079:
Add two new macros DRIVER_MODULE_ORDERED() and EARLY_DRIVER_MODULE_ORDERED()
that allow a module to use an order other than the default of
SI_ORDER_MIDDLE when registering a driver.  This can be useful for drivers
in a kld that contain multiple new-bus drivers as part of one logical device
driver.  A typical case would be to use SI_ORDER_LAST for the "main" driver
to ensure that any other "helper" drivers are registered and available
before the "main" driver attempts to attach.

git-svn-id: svn://svn.freebsd.org/base/stable/8@225625 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f