MFC r293105:

Eliminate code for walking through the early static env data. This code
is called from a device attach routine, and thus cannot be called before
the cutover from static to dynamic kernel env.

MFC r263710, r273377, r273378, r273423 and r273455:

- De-vnet hash sizes and hash masks.
- Fix multiple issues related to arguments passed to SYSCTL macros.

Sponsored by: Mellanox Technologies

MFC r257334, r257336, r257337, r257338, r257341, r257342, r257343, r257370,
r257368, r257416

Hints-only devices should return BUS_PROBE_NOWILDCARD from their probe
methods.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- Use the consistenly PHY-specific reset routine PHY_RESET() rather than
generic mii_phy_reset().
- Return the result of mii_mediachg() rather than blindly returning 0.
- on smsc(4), driver lock should be held to get current
mii_media_active/mii_media_status value.

Reviewed by: yongari

Mechanically substitute flags from historic mbuf allocator with
malloc(9) flags in sys/dev.

ether_ifattach() sets if_mtu to ETHERMTU, don't bother set it again

Reviewed by: yongari

- There's no need to overwrite the default device method with the default
one. Interestingly, these are actually the default for quite some time
(bus_generic_driver_added(9) since r52045 and bus_generic_print_child(9)
since r52045) but even recently added device drivers do this unnecessarily.
Discussed with: jhb, marcel
- While at it, use DEVMETHOD_END.
Discussed with: jhb
- Also while at it, use __FBSDID.

Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.

The SYSCTL_NODE macro defines a list that stores all child-elements of
that node. If there's no SYSCTL_DECL macro anywhere else, there's no
reason why it shouldn't be static.

Fix typo, lost 0 in SYSCTL_ADD_INT usage.

Support of Ralink Ethernet MAC, used in RT3050F/RT3052F and I belive in other Ralink SoCs.

Approved by: adrian (mentor)