hw-breakpoints: Wrap in the KVM breakpoint active state check

Wrap in the cpu dr7 check that tells if we have active
breakpoints that need to be restored in the cpu.

This wrapper makes the check more self-explainable and also
reusable for any further other uses.

Reported-by: Jan Kiszka <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
Cc: Avi Kivity <[email protected]>
Cc: "K. Prasad" <[email protected]>

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