[intel-ethernet] I211: support link state change interrupt

- enables netstack notifications on cable connect/disconnect for I211

Test: cable dancing with my I211-having device
Change-Id: I6b4f6761e784d35d1d793217c74ad97cd0cfcfcf

[intel-ethernet] better support intel I211 ethernet

- ZX-2062
- ZX-2061

Updated initialization sequence to handle I211 explicitly, modified
other intel init a bit too, nothing too crazy.

Test: checked networking in qemu, I211 and I219 parts on toulouse, and a couple of NUCs
Change-Id: Id400772f10972410401a59ed9def66f761a6a6ec

[intel-ethernet] Handle short packets.

When a linux-guest transmits packets they may be shorter than 60 bytes.
Handle these cases by padding out to the minimum packet size instead of
failing to transmit.

Change-Id: I0d7cd3988bb72bba5cfda9245f0e4bc30e4c4a00

[intel-ethernet] Fix Tx capability on i217

All transmissions are suspended unless reserved bit 28 of TCTL
is set. For minimum disruption, leave all TCTL reserved bits
unchanged when writing to them.

ZX-1516

Change-Id: I6c43b78ec5f276822d1223cd2122ed40785636d3

[dev][ethernet] Bit-twiddling for promiscuous mode

Add bit-twiddling to turn promiscuous on and off for AX88179, AX887722b,
Realtek 8111, and intel-ethernet drivers.

Test: builds; ethernet still works.

NET-9

Change-Id: I3683685c8e2969096621599f92e6d01f68fed404

[intel-ethernet] Add support for suspend/resume

On suspend, disable rx and tx queues and power down the PHY.

ZX-1420

Change-Id: I47d776f04ff981aa4bb52f3611817f62d2a3993c

[ethernet] Add support for asynchronous eth tx

queue_tx replaces send as the interface for both synchronous and
asynchronous transmissions. Tx data is now passed using ethmac_netbuf_t
structures. If the driver chooses to hold on to the netbuf until
buffer space is available, it can return ZX_ERR_SHOULD_WAIT from queue_tx
and call the ethmac complete_tx() callback when the netbuf is no longer
needed.

NET-212

Change-Id: I2da2c503a12fbea0f8c74d8d1e05b83161a15f4a

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[eth-intel] Reports link status for intel ethernet

Change-Id: Iba796a41d2fa1f4cd289375fe4a17ec51b98d489

[dev][ethernet] Use new magenta errors

Change-Id: Iffc06176ac9cbb9e539aad8884b10eec8d919bf0

[udev][intel-ethernet] rename

Change-Id: Ia58bcb7fc7ae82d66bb3714b12f372cc3ad235bd