LinuxKPI: add module_pci_driver() and pci_alloc_irq_vectors()

Add the two new functions needed by rtw88 to register the driver and
handle the module bits as well as a version of pci_alloc_irq_vectors()
for what is needed.

Reviewed by: hselasky
MFC after: 10 days
Differential Revision: https://reviews.freebsd.org/D30981