clocksource: hyper-v: Provide noinstr sched_clock()

With the intent to provide local_clock_noinstr(), a variant of
local_clock() that's safe to be called from noinstr code (with the
assumption that any such code will already be non-preemptible),
prepare for things by making the Hyper-V TSC and MSR sched_clock
implementations noinstr.

Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Co-developed-by: Michael Kelley <[email protected]>
Signed-off-by: Michael Kelley <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Tested-by: Michael Kelley <[email protected]>  # Hyper-V
Link: https://lore.kernel.org/r/[email protected]

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