x86 timer updates:

  - A series of commits to make the MSR derived CPU and TSC frequency more
    accurate.

    It turned out that the frequency tables which have been taken from the
    SDM are inaccurate because the SDM provides truncated and rounded
    values, e.g. 83.3Mhz (83.3333...) or 116.7Mhz (116.6666...).

    This causes time drift in the range of ~1 second per hour
    (20-30 seconds per day). On some of these SoCs it's not possible to
    recalibrate the TSC because there is no reference (PIT, HPET) available.

    With some reverse engineering it was established that the possible
    frequencies are derived from the base clock with fixed multiplier /
    divider pairs.

    For the CPU models which have a known crystal frequency the kernel now
    uses multiplier / divider pairs which bring the frequencies closer to
    reality and fix the observed time drift issues.
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