[CPUFREQ][3/8] acpi-cpufreq: Pull in MSR based transition support

Add in the support for Intel Enhanced Speedstep - MSR based transitions.
With this change, the ACPI based support in speedstep-centrino can be
deprecated and duplicate code in that driver can be marked for removal.
Much easier to maintain and support this way. This also reduces the
user misconfigurations and questions on which driver is to be used
under which CPUs to support Enhanced Speedstep.

Signed-off-by: Denis Sadykov <denis.m.sadykov@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>