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'

Signed-off-by: Dirk Behme <dirk.behme_at_gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>