CPUFREQ: Make acpi-cpufreq more robust against BIOS freq changes behind our back.

CPUFREQ: Make acpi-cpufreq more robust against BIOS freq changes behind our back.

upstream commit: e56a727b023d40d1adf660168883f30f2e6abe0a

We checked the hardware freq with OS cached freq value in get_cur_freqon_cpu().

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Dave Jones <davej@redhat.com>
Cc: Thomas Renninger <trenn@suse.de>
Cc: "Anthony L. Awtrey" <tony@awtrey.com>
[chrisw: backport to 2.6.25.4]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>