hrtimer: Update hrtimer_resolution only if value changes

Currently, the hrtimer_switch_to_hres() function unconditionally updates
hrtimer_resolution to HIGH_RES_NSEC.  This causes KCSAN false positives
in kernels built with CONFIG_KCSAN_STRICT=y.  It also causes unnecessary
cache-line traffic on the many code paths that load hrtimer_resolution,
which is especially regrettable because the value of hrtimer_resolution
normally changes only once during the lifetime of a given kernel.

Therefore, update the value of hrtimer_resolution to HIGH_RES_NSEC only
if it does not already have that value.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260919001428.3133388-10-paulmck@kernel.org

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