parisc: do not count IPI calls twice

The number of IPI calls is already visible as per-cpu IPI irq counters
in/proc/cpuinfo, so let's drop this additional counting.

This partly reverts:
cd85d55 parisc: more irq statistics in /proc/interrupts

Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/hardirq.h

@@ -21,7 +21,6 @@ typedef struct {
 	unsigned int irq_stack_usage;
 #ifdef CONFIG_SMP
 	unsigned int irq_resched_count;
-	unsigned int irq_call_count;
 #endif
 	unsigned int irq_unaligned_count;
 	unsigned int irq_fpassist_count;