[SK98LIN]: 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/sk98lin/h/skdrv1st.h

@@ -69,6 +69,7 @@ typedef struct s_AC	SK_AC;
 #include <linux/bitops.h>
 #include <asm/byteorder.h>
 #include <asm/io.h>
+#include <asm/irq.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>