staging: r8188eu: fall back to random mac address

Call eth_random_addr to generate a random mac address if we cannot load
the mac address from the efuses.

Do not use a constant mac address as fallback. This may create conflicts
if we have several r8188eu devices on the network.

Suggested-by: Joe Perches <[email protected]>
Tested-by: Philipp Hortmann <[email protected]> # Edimax N150
Reviewed-by: Pavel Skripkin <[email protected]>
Signed-off-by: Martin Kaiser <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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