cpufreq: introduce cpufreq_generic_get() routine

CPUFreq drivers that use clock frameworks interface,i.e. clk_get_rate(),
to get CPUs clk rate, have similar sort of code used in most of them.

This patch adds a generic ->get() which will do the same thing for them.
All those drivers are required to now is to set .get to cpufreq_generic_get()
and set their clk pointer in policy->clk during ->init().

Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --cc drivers/cpufreq/at32ap-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/cpufreq-cpu0.c
Simple merge

diff --cc drivers/cpufreq/cpufreq.c
Simple merge

diff --cc drivers/cpufreq/davinci-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/dbx500-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/exynos-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/exynos5440-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/imx6q-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/loongson2_cpufreq.c
Simple merge

diff --cc drivers/cpufreq/omap-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/ppc-corenet-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/s3c24xx-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/s3c64xx-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/s5pv210-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/spear-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/tegra-cpufreq.c
Simple merge

diff --cc drivers/cpufreq/unicore2-cpufreq.c
Simple merge

diff --cc include/linux/cpufreq.h
Simple merge