kernel: power: qos: Set PM_QOS_SUM type for each cpu

If a memory bandwidth constraint is added, pm_qos_set_value_for_cpu()
throws an BUG as PM_QOS_SUM type is not handled. Add the new value to
the target_per_cpu variable to provide an overall memory bandwidth
requirement for each cpu.

Change-Id: I44b2954bb799ea1f8e21de5c590ea6fa483359ac
Signed-off-by: Archana Sathyakumar <asathyak@codeaurora.org>