MIPS: Add missing #inclusions of <linux/irq.h>

Add missing #inclusions of <linux/irq.h> to a whole bunch of files that should
really include it.  Note that this can replace #inclusions of <asm/irq.h>.

This is required for the patch to sort out irqflags handling function naming to
compile on MIPS.

The problem is that these files require access to things like setup_irq() -
which isn't available by #including <linux/interrupt.h>

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/vr41xx/common/irq.c

@@ -19,6 +19,7 @@
  */
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/irq.h>
 
 #include <asm/irq_cpu.h>
 #include <asm/system.h>