ARM: OMAP: Remove warnings in DSP code

Remove warnings:

arch/arm/plat-omap/dsp/dsp_common.c: In function 'dsp_cpustat_update':
arch/arm/plat-omap/dsp/dsp_common.c:317: warning: implicit declaration of function 'enable_irq' arch/arm/plat-omap/dsp/dsp_common.c:325: warning: implicit declaration of function 'disable_irq'

arch/arm/plat-omap/dsp/task.c: In function 'dsp_task_write_bk':
arch/arm/plat-omap/dsp/task.c:1232: warning: implicit declaration of function 'disable_irq' arch/arm/plat-omap/dsp/task.c:1232: warning: implicit declaration of function 'enable_irq'

@@ -32,6 +32,7 @@
 #include <linux/mm.h>
 #include <linux/clk.h>
 #include <linux/mutex.h>
+#include <linux/interrupt.h>
 #include <asm/io.h>
 #include <asm/tlbflush.h>
 #include <asm/irq.h>

@@ -37,6 +37,7 @@
 #include <linux/mm.h>
 #include <linux/proc_fs.h>
 #include <linux/mutex.h>
+#include <linux/interrupt.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/signal.h>