x86/hpet: Add function to select a /dev/hpet channel

If CONFIG_HPET=y is enabled the x86 specific HPET code should reserve at
least one channel for the /dev/hpet character device, so that not all
channels are absorbed for per CPU clockevent devices.

Create a function to assign HPET_MODE_DEVICE so the rework of the
clockevents allocation code can utilize the mode information instead of
reducing the number of evaluated channels by #ifdef hackery.

The function is not yet used, but provided as a separate patch for ease of
review. It will be used when the rework of the clockevent selection takes
place.

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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