[SIS900]: Driver needs to include asm/irq.h

Otherwise declarations for disable_irq()/enable_irq() will
not be obtained on platforms not doing CONFIG_GENERIC_HARDIRQS.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sis900.c

@@ -69,6 +69,7 @@
 
 #include <asm/processor.h>      /* Processor type for cache alignment. */
 #include <asm/io.h>
+#include <asm/irq.h>
 #include <asm/uaccess.h>	/* User space memory access functions */
 
 #include "sis900.h"