LinuxKPI: pci: implement pcim_iomap()

[bz]

Summary

Like pci_iomap() add the devres version pcim_iomap() using the former
to get the resource.

Add a helper function to validate that the bar is within a valid range
and sprinkle that check also to other related functions.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

[dumbbell]

sys/compat/linuxkpi/common/src/linux_pci.c

873–874

Perhaps we could put the setting of both tables in a static function to not duplicate code? The same logic is already present in linuxkpi_pcim_iomap_regions(). What do you think?

[bz]

Factor out setting table into its own function.

[bz]

sys/compat/linuxkpi/common/src/linux_pci.c

148

static