Add PNP metadata to more drivers

[cem]

Summary

GPUs: radeonkms, i915kms
NICs: if_em, if_igb, if_bnxt

This metadata isn't used yet, but it will be handy to have later to
implement automatic module loading.

[cem]

sys/dev/drm2/i915/i915_drv.c

425

Note that MODULE_DEVICE_TABLE is almost perfect as a Linux macro we can use via the linuxkpi for this metadata. The only problem is that different linuxkpi consumers use different pciid structs.

DRM drivers embed the vendor, device, and a human readable string.

Mellanox NIC drivers use the Linux struct pci_device_id, which has more members but lacks the human-readable string.

If Linuxkpi consumers could unify on a pci device id struct, we could use the existing MODULE_DEVICE_TABLE() macros for these drivers instead.