stand/kshim: Replace devclass_equal with calls to strcmp

Reviewed by: imp, markj, emaste
Differential Revision: https://reviews.freebsd.org/D48412

stand/kshim: Implement bus_detach_children

While here, update bus_generic_detach to delete devices as in the
kernel.

Reviewed by: imp, markj
Differential Revision: https://reviews.freebsd.org/D48410

stand/kshim: Update for devclass being removed from DRIVER_MODULE

The kshim code abused the devclass argument to DRIVER_MODULE in some
odd ways. Instead, refactor the devclass handling to more clos

stand/kshim: Update for devclass being removed from DRIVER_MODULE

The kshim code abused the devclass argument to DRIVER_MODULE in some
odd ways. Instead, refactor the devclass handling to more closely
mirror what new-bus does in the kernel by having a linked list of
devclasses looked up by name and associate devices with a devclass.

Devices are now only associated with a module while probing and
attaching.

Reviewed by: imp, markj
Differential Revision: https://reviews.freebsd.org/D48409

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stand/kshim: Replace bus_generic_attach with bus_attach_children

Fixes: 18250ec6c089 Replace calls to bus_generic_attach with bus_attach_children
Differential Revision: https://reviews.freebsd.org/D

stand/kshim: Replace bus_generic_attach with bus_attach_children

Fixes: 18250ec6c089 Replace calls to bus_generic_attach with bus_attach_children
Differential Revision: https://reviews.freebsd.org/D48404

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Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

Add missing busdma prototypes for load and unload and implement dummy sync
function for kernel bootloader shim code.

MFC after: 1 week
Sponsored by: Mellanox Technologies // NVIDIA Networking

Tidy up code a bit. Add missing section comments.
No functional change.

MFC after: 1 week
Sponsored by: Mellanox Technologies // NVIDIA Networking

Merge ^/head r325663 through r325841.

Move sys/boot to stand. Fix all references to new location

Sponsored by: Netflix