cpufreq: dynamic: add doc link

Signed-off-by: Shilin Victor <chrono.monochrome@gmail.com>
cpufreq: dynamic: sync with Zen-project

commits 9158577..3498ac1
gpu frequency stats
mali: ux500: zero boost_stat values

Signed-off-by: Shilin Victor <chrono.monochrome@gmail.com>