hrtimer: Drop _tv64() helpers
Since ktime_t has become an alias to s64, these helpers are unnecessary.
Migrate the few remaining users to the regular helpers and remove the
now dead code.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260107-hrtimer-header-cleanup-v1-3-1a698ef0ddae@linutronix.de
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