PM: QoS: Export dev_pm_qos_read_value

Export the function dev_pm_qos_read_value(). Most other functions
mentioned in Documentation/power/pm_qos_interface.rst are already
exported, so export this one as well.

This function will be used to read the resume latency in a driver that
can also be compiled as a module.

Signed-off-by: Markus Schneider-Pargmann <[e-mail]>
Tested-by: Kevin Hilman <[e-mail]>
Tested-by: Roger Quadros <[e-mail]>
Reviewed-by: Dhruva Gole <[e-mail]>
Reviewed-by: Kevin Hilman <[e-mail]>
Acked-by: Rafael J. Wysocki <[e-mail]>
Link: https://lore.kernel.org/lkml/[e-mail]/
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Nishanth Menon <[e-mail]>

drivers/base/power/qos.c

···
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(dev_pm_qos_read_value);
 
 /**
  * apply_constraint - Add/modify/remove device PM QoS request.