net: tipc: remove unused hardirq.h

Preempt counter APIs have been split out, currently, hardirq.h just
includes irq_enter/exit APIs which are not used by TIPC at all.

So, remove the unused hardirq.h.

Signed-off-by: Yang Shi <yang.s@alibaba-inc.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Tested-by: Ying Xue <ying.xue@windriver.com>
Cc: Jon Maloy <jon.maloy@ericsson.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/core.h

@@ -49,7 +49,6 @@
 #include <linux/uaccess.h>
 #include <linux/interrupt.h>
 #include <linux/atomic.h>
-#include <asm/hardirq.h>
 #include <linux/netdevice.h>
 #include <linux/in.h>
 #include <linux/list.h>