qos: wake up cores based on the qos updated cpu mask

If the qos value is increased only for a subset of cpu's
aggregated qos for those cpu's is still the previous value.
This is because the qos request list is maintained per
request and not per cpu. In this case as there is no change
in aggregated qos value, these cpu's are not wokenup to
take the new qos value into effect.

So wakeup cpu's even if the aggregated qos value does not change
but the cpumask changes.

Change-Id: If5a4a100108e85e04beb77e5249bd6c452672edf
Signed-off-by: Anil Kumar Mamidala <amami@codeaurora.org>