sh_eth: get rid of the 2nd parameter to sh_eth_dev_init()

sh_eth_dev_init()  is now always called with  'true' as the  2nd argument,
so that there's no more sense in having 2 parameters to this function...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>