tegra: remove CONFIG_USB_ETHER_SMSC95XX from boards without it
The SMSC95xx series may exist either directly on a main board, or as a USB
to Ethernet dongle. However, dongles containing these chips are very rare.
Hence, remove this config option, except on Harmony where such a chip is
actually present on the board.
The asix option remains, since it's a popular chip, and I actively use a
dongle containing this.
Signed-off-by: Stephen Warren <[email protected]>
Signed-off-by: Tom Warren <[email protected]>
Acked-by: Igor Grinberg <[email protected]>