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>
diff --git a/arch/mips/rb532/serial.c b/arch/mips/rb532/serial.c
index 00ed19f..7048254 100644
--- a/arch/mips/rb532/serial.c
+++ b/arch/mips/rb532/serial.c
@@ -29,6 +29,7 @@
 #include <linux/tty.h>
 #include <linux/serial_core.h>
 #include <linux/serial_8250.h>
+#include <linux/irq.h>
 
 #include <asm/serial.h>
 #include <asm/mach-rc32434/rb.h>