brcm63xx: Add nvg578 profile

Andreas Gnaurequested to merge
agnau-nvg578 into devel

Add initial support for the "NVG578" BCM96856-based profile.

Only NVG578HLX is supported for now. Black Ethernet-port 1 is not working. Ethernet port 4 set to operate as WAN-port for now.

Signed-off-by: Andreas Gnau andreas.gnau@iopsys.eu

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