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/sni/a20r.c

@@ -10,6 +10,7 @@
 
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/platform_device.h>
 #include <linux/serial_8250.h>
 

arch/mips/sni/pcimt.c

@@ -11,6 +11,7 @@
 
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/pci.h>
 #include <linux/serial_8250.h>
 

arch/mips/sni/pcit.c

@@ -10,6 +10,7 @@
 
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/pci.h>
 #include <linux/serial_8250.h>
 

arch/mips/sni/rm200.c

@@ -13,6 +13,7 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/platform_device.h>
 #include <linux/serial_8250.h>
 #include <linux/io.h>

arch/mips/sni/time.c

@@ -1,5 +1,6 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/smp.h>
 #include <linux/time.h>
 #include <linux/clockchips.h>