Normalize bhnd(4) device matching API

[landon_landonf.org]

Summary

This unifies handling of core, chip, and board-level device
matching, and adds support for matching device drivers
against the bus attach type (e.g. SoC vs WiFi adapter).

Core-level quirks on Broadcom's chipsets generally are specific
to some combination of chip model, core revision, chip
package (e.g. 12x9 SMT package), SROM revision, etc.

Unifying the match APIs for all three attribute types (core, chip,
board/srom) allows defining a single device quirk table that
matches across all of those attributes.

Depends on D6471

Test Plan

Verified that all devices attach with expected quirk flags
on BCM4331, BCM4312

[landon_landonf.org]

• Rebased against HEAD
• Fix typo in BCM4706 quirk hwrev.
• Re-enable the PCIe-G2 quirk table.