libethdrivers: Check interface value before call

Don't call the allocate_rx_buf interface if it hasn't been setup by the
other end of the interface yet.

libethdrivers: Add zynq7000,imx6 Eth driver module

This commit adds driver module definitions for the zynq7000, and imx6
Ethernet drivers in libethdrivers. The driver module grabs the necessary
resources and off-loads the Ethernet initialisation to the original
initialisation functions.

imx6/zynq7000: Add functions for getting MAC addr

1. Add get_mac function to raw_iface_funcs so Ethdriver
components can get device MAC address

2. Remove the code for configuring custom MAC address

libethdrivers: Add imx8mq-evk support

The imx8mq-evk reuses the imx6 Ethernet drivers as the devices and setup
are very similar. This is a bit of a hack at the moment and will
eventually be cleaned up.

trivial: Style changed files

libethdrivers: Include missing gen_config.h file

These source files were missing '#define' defintions that are generated
from CMake config options.

Fixed memory issue during rx packet caused by a wrong intiialization of the rx ring buffer

Implemented MAC Address formatting

This expects the Ethdriver component to fill a structure
with relevent information, including whether Promiscuous mode
should be set. This allows the ethernet hardware to pass every
packet up to the Ethdriver component. This is neccessary when
there are multiple routers connected to the Ethdriver.

The other field that gets set is the MAC Address array. If
promiscuous mode is set, then it doesn't matter what the
Hardware MAC Address is defined as, because the Ethdriver
filters packet based on the destination MAC Address. However,
if there is only a single component, the Ethdriver fills the
array with the MAC Address configured in the CAmkES
Configuration. The Driver then sets the Hardware MAC Address
to that value.

This means that the Default MAC address for a single client will
be based on what is defined for the client, and not what is the
default for the board.

Change-Id: Id24b8a28ac95091d741574eac9046c1d500af048

Changes in i.MX6 Driver to accomodate virtual and physical buffers.

Original driver code assumes an IOMMU with a 1:1 mapping. This change
allows for other mappings.

Change-Id: I20511b29b19a606d910c14514fc79897af644629

Fix whitespace

- remove trailing whitespace
- remove duplicate blank lines
- remove blank lines at end of file

fix licenses

Remove trailing whitespace