LinuxKPI: add general module_driver(), use it for module_pci_driver()

Factor out module_pci_driver() from 366d68f283793 into a general
module_driver() so other bus attachments can also use the same

LinuxKPI: add general module_driver(), use it for module_pci_driver()

Factor out module_pci_driver() from 366d68f283793 into a general
module_driver() so other bus attachments can also use the same kind
of macro without duplicating all the lines.

Redefine module_pci_driver() using the new general macro.

No functional changes intended.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: manu
Differential Revision: https://reviews.freebsd.org/D46467

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