cfa10036: linux usb gadget changed to USB Ethernet

Remove the USB Gadget Composite CDC ACM/ECM interfaces from the
Linux build in favor of the USB Ethernet Gadget.  Enable the USB
Ethernet Gadget's support of RNDIS and CDC EEM.  Windows platforms
support RNDIS natively while Linux can use either RNDIS or EEM
(preferring EEM on modern systems).

Used a full linux kernel config file, otherwise the
"make buildroot_defconfig" the CONFIG_USB_GADGET and
CONFIG_USB_ETH get magically changed from =y to =m.

Signed-off-by: Rob Emanuele <rje@bitstruct.com>
cfa10036: inittab does not spawn getty on the now removed /dev/ttyGS0

Signed-off-by: Rob Emanuele <rje@bitstruct.com>
cfa10036: barebox to use g_ether parameters

When using the new g_ether driver, use the default g_ether RNDIS VID/PID and
keep the Manufacturer=Crystalfontz and Product=CFA-10036 in the kernel boot
parameters.

Signed-off-by: Rob Emanuele <rje@bitstruct.com>
Merge pull request #1 from bitstruct/usb-net-gadget-changes

Usb net gadget changes