Moment raw/atomic timestamps should be represented as `AtomicI64`

[FelixMcFelix]

opte/lib/opte/src/ddi/time.rs

Lines 96 to 106 in 16ef8c6

	/// Return the underlying timestamp for atomic storage or debugging.
	pub(crate) fn raw(&self) -> u64 {
	cfg_if! {
	if #[cfg(all(not(feature = "std"), not(test)))] {
	self.inner as u64
	} else {
	// Conversion here is truncating.
	self.inner.as_nanos() as u64
	}
	}
	}

hrtime_t is equivalent to i64, so we should not be exporting the raw timestamp value as a u64 (or using it in flow entries as an AtomicU64, for that matter).