x86: use cpu_khz for loops_per_jiffy calculation

On the x86 platform we can use the value of tsc_khz computed during tsc
calibration to calculate the loops_per_jiffy value. Its very important
to keep the error in lpj values to minimum as any error in that may
result in kernel panic in check_timer. In virtualization environment, On
a highly overloaded host the guest delay calibration may sometimes
result in errors beyond the ~50% that timer_irq_works can handle,
resulting in the guest panicking.

Does some formating changes to lpj_setup code to now have a single
printk to print the bogomips value.

We do this only for the boot processor because the AP's can have
different base frequencies or the BIOS might boot a AP at a different
frequency.

Signed-off-by: Alok N Kataria <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Daniel Hecht <[email protected]>
Cc: Tim Mann <[email protected]>
Cc: Zach Amsden <[email protected]>
Cc: Sahil Rihan <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

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