xtensa: ISS: fix command line parameter name

Now 'ethX=...' syntax can actually be used in kernel command line to
specify network interfaces.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
diff --git a/arch/xtensa/platforms/iss/network.c b/arch/xtensa/platforms/iss/network.c
index 6d9cc45..0c7c1d4 100644
--- a/arch/xtensa/platforms/iss/network.c
+++ b/arch/xtensa/platforms/iss/network.c
@@ -681,7 +681,7 @@
 
 #undef ERR
 
-__setup("eth=", iss_net_setup);
+__setup("eth", iss_net_setup);
 
 /*
  * Initialize all ISS Ethernet devices previously registered in iss_net_setup.