cpufreq: interactive: Report CPU loads through govinfo notifier

Report CPU load to modules subscribed to cpufreq govinfo notification
chain every time governor timer expires to evaluate load.

Change-Id: I0b35947b1924c179649aafa0b7b93d974164af1a
[junjiew@codeaurora.org: Resolved trivial merge conflicts]
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>