ARM: Enable CPU_PM notifiers on ARM machines.

Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Tested-and-Acked-by: NShawn Guo <shawn.guo@linaro.org>
Tested-by: NVishwanath BS <vishwanath.bs@ti.com>

arch/arm/Kconfig

@@ -29,6 +29,7 @@ config ARM
 	select HAVE_GENERIC_HARDIRQS
 	select HAVE_SPARSE_IRQ
 	select GENERIC_IRQ_SHOW
+	select CPU_PM if (SUSPEND || CPU_IDLE)
 	help
 	  The ARM series is a line of low-power-consumption RISC chip designs
 	  licensed by ARM Ltd and targeted at embedded applications and