sh: Kill off duplicate includes.

Caught by the surprisingly not-entirely-useless 'includecheck'.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/boards/renesas/sh7710voipgw/setup.c

@@ -11,7 +11,6 @@
 #include <asm/machvec.h>
 #include <asm/irq.h>
 #include <asm/io.h>
-#include <asm/irq.h>
 
 static struct ipr_data sh7710voipgw_ipr_map[] = {
 	{ TIMER2_IRQ, TIMER2_IPR_ADDR, TIMER2_IPR_POS, TIMER2_PRIORITY },

arch/sh/boards/se/7206/irq.c

@@ -9,7 +9,6 @@
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/io.h>
-#include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <asm/se7206.h>
 

arch/sh/kernel/irq.c

@@ -11,7 +11,6 @@
 #include <linux/module.h>
 #include <linux/kernel_stat.h>
 #include <linux/seq_file.h>
-#include <linux/irq.h>
 #include <asm/processor.h>
 #include <asm/machvec.h>
 #include <asm/uaccess.h>