PM / devfreq: Introduce a memory-latency governor

Use performance counters to detect the memory latency sensitivity
of CPU workloads and vote for higher DDR frequency if required.

Change-Id: Ie77a3523bc5713fc0315bd0abc3913f485a96e0e
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>
Suggested-by: Saravana Kannan <skannan@codeaurora.org>
[junjiew@codeaurora.org: dropped changes in arch/arm64/Kconfig]
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
[core-freq mapping table]
Signed-off-by: David Keitel <dkeitel@codeaurora.org>
[Use proper macro in header file]
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>
[some bugfixes, cleanup]
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
[Remove hotplug code]
Signed-off-by: Jonathan Avila <avilaj@codeaurora.org>