Pull timekeeping updates from Andreas Hindborg:
- Add methods on 'HrTimer' that can only be called with exclusive
access to an unarmed timer, or form timer callback context.
- Add arithmetic operations to 'Instant' and 'Delta'.
- Add a few convenience and access methods to 'HrTimer' and 'Instant'.
* tag 'rust-timekeeping-v6.18' of https://github.com/Rust-for-Linux/linux:
rust: time: Implement basic arithmetic operations for Delta
rust: time: Implement Add<Delta>/Sub<Delta> for Instant
rust: hrtimer: Add HrTimer::expires()
rust: time: Add Instant::from_ktime()
rust: hrtimer: Add forward_now() to HrTimer and HrTimerCallbackContext
rust: hrtimer: Add HrTimerCallbackContext and ::forward()
rust: hrtimer: Add HrTimer::raw_forward() and forward()
rust: hrtimer: Add HrTimerInstant
rust: hrtimer: Document the return value for HrTimerHandle::cancel()
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