sh: sh7785lcr/highlander/hp6xx need linux/irq.h.

More build fixes..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/board-sh7785lcr.c

@@ -18,6 +18,7 @@
 #include <linux/i2c.h>
 #include <linux/i2c-pca-platform.h>
 #include <linux/i2c-algo-pca.h>
+#include <linux/irq.h>
 #include <asm/heartbeat.h>
 #include <mach/sh7785lcr.h>
 

arch/sh/boards/mach-highlander/setup.c

@@ -18,6 +18,7 @@
 #include <linux/ata_platform.h>
 #include <linux/types.h>
 #include <linux/i2c.h>
+#include <linux/irq.h>
 #include <net/ax88796.h>
 #include <asm/machvec.h>
 #include <mach/highlander.h>

arch/sh/boards/mach-hp6xx/setup.c

@@ -12,9 +12,9 @@
 #include <linux/types.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
+#include <linux/irq.h>
 #include <asm/hd64461.h>
 #include <asm/io.h>
-#include <asm/irq.h>
 #include <mach/hp6xx.h>
 #include <cpu/dac.h>