x86/tsc: Fix diagnostics for TSC frequency

x86/tsc: Fix diagnostics for TSC frequency

A Gemini Lake platform prints:

  (XEN) CPU0: TSC: 19200000MHz * 279 / 3 = 1785600000MHz
  (XEN) CPU0: 800..1800 MHz

during boot.  The units on the first line are Hz, not MHz, so correct that and
add a space for clarity.

Also, for the min/max line, use three dots instead of two and add more spaces
so that the line can't be mistaken for being a double decimal point typo.

Boot now reads:

  (XEN) CPU0: TSC: 19200000 Hz * 279 / 3 = 1785600000 Hz
  (XEN) CPU0: 800 ... 1800 MHz

Extend these changes to the other TSC diagnostics.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>