Fix panic on 4430 for the temp sensor idle

Fix panic on 4430 for the temp sensor idle

On 4430 the on-die temp sensor is not used.  But the CPU idle
path still calls the temp sensor idle.  This is not right

Only allow idle on 4460.

Change-Id: I1e9be21bc0d6d05c015d718121b04e01d905efb1
Signed-off-by: Dan Murphy <dmurphy@ti.com>

Conflicts:
	drivers/staging/thermal_framework/sensor/omap_temp_sensor.c