XTENSA: Emphasize that the "eth" boot-time parm takes a value

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

arch/xtensa/platform-iss/network.c

@@ -798,7 +798,7 @@ static int iss_net_setup(char *str)
 
 #undef ERR
 
-__setup("eth", iss_net_setup);
+__setup("eth=", iss_net_setup);
 
 /*
  * Initialize all ISS Ethernet devices previously registered in iss_net_setup.