x86/hpet: Carve out shareable parts of init_one_hpet_msi_clockevent()

To finally remove the static channel0/clockevent storage and to utilize the
channel 0 storage in hpet_base, it's required to run time initialize the
clockevent. The MSI clockevents already have a run time init function.

Carve out the parts which can be shared between the legacy and the MSI
implementation.

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ricardo Neri <[email protected]>
Cc: Ashok Raj <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Suravee Suthikulpanit <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Ravi Shankar <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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