msm: cpufreq: Add support for CPU clocks and msm-cpufreq device

Add support for using clock APIs to do CPU/L2 frequency scaling. When clock
APIs are used to control CPU/L2 frequencies, the cpufreq driver must handle
the CPU -> L2 -> DDR bandwidth voting. Use a msm-cpufreq device to provide
the per SoC list of CPU frequencies and their L2/DDR bandwidth mapping
information.

If CPU/L2 clocks are not available, fallback to using acpuclock APIs. We
eventually want to remove the use of non-standard acpuclock APIs.

Conflicts:

        arch/arm/mach-msm/cpufreq.c

Change-Id: I0f8a9608d3030d39660e0363f6e86e60b7c4b6e4
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
msm: cpufreq: Update frequency index

A deprecated api can be used to limit the minimum and maximum cpu speeds.
Another driver temporarily needs to switch back to this api, instead of
using the new version. Make this api functional again by ensuring a stale
value is updated properly.

Change-Id: Ia63772e43ec534cf2bb58e7627a87315dae5d891
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
msm: cpufreq: Add msm_cpufreq debugfs file to show CPU -> L2/BW mapping

Example output:
cat /sys/kernel/debug/clk/msm_cpufreq
  CPU (KHz)  L2 (KHz)  Mem (MBps)
     300000    300000         600
     422400    422400        1200
     652800    499200        1600
     729600    576000        2456
     883200    576000        2456
     960000    960000        3680
    1036800   1036800        3680
    1190400   1036800        3680
    1267200   1267200        6400
    1497600   1497600        6400
    1574400   1574400        6400
    1728000   1651200        6400
    1958400   1728000        7448
    2265600   1728000        7448

Change-Id: I20df8c3778c0fcd0ef1f369acb1cb72cf5334812
Signed-off-by: Xiaogang Cui <xiaogang@codeaurora.org>