built-in vs loadable modules and userconf

["John D. Baker" <jdbaker%consolidated.net@localhost>]

I'm curious to see if changes to ahci_sata code in -current fixes the
problem in PR kern/54289.  On the primary test machine I have it does
not.

The only other machine to exhibit the problem is my file server using
RAIDframe.  I nearly lost the RAID booting a netbsd-9 kernel when half
of the disks failed to identify due the problem in the PR.

If I boot a -current kernel in userconf mode (boot -c) and disable the
built-in "raid" device, this should prevent the raid from trying to
configure and failing if the problem is still present.

I want to be sure that a disabled built-in module won't cause a loadable
module to be loaded and defeat the disabling of the built-in "raid" device.

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