Wakeup userspace poll on change of cpu frequency. The userspace may then take action to change the power/performance characteristics of the device. Change-Id: I3030b22084fe7e0143b978a198ddcc579e7d6e83 Signed-off-by: Amar Singhal <asinghal@codeaurora.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>