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/kernel/traps.c

@@ -28,6 +28,7 @@
 #include <linux/kprobes.h>
 #include <linux/notifier.h>
 #include <linux/kdb.h>
+#include <linux/irq.h>
 
 #include <asm/bootinfo.h>
 #include <asm/branch.h>
@@ -51,7 +52,6 @@
 #include <asm/mmu_context.h>
 #include <asm/types.h>
 #include <asm/stacktrace.h>
-#include <asm/irq.h>
 #include <asm/uasm.h>
 
 extern void check_wait(void);