timers: Switch hrtimer_init() to hrtimer_setup() & rename of other timer functions

JIRA: https://issues.redhat.com/browse/RHEL-114125
MR: !1425 (merged)

Omitted-fix: 25b2f46bd7de ("wifi: ath12k: ahb: Replace del_timer_sync() with timer_delete_sync()")

This MR backport most of the timers cleanup commits from tag 'timers-cleanups-2025-03-23' of the upstream tip tree to facilitate the rebase of the kernel/time subsystem in a future MR. These commits switch the hrtimer_init() calls in various kernel subsystems to the equivalent hrtimer_setup() call with no functional change.

This MR also includes a number of other patches doing treewide rename of timer functions. For example, one of the patches does a treewide rename of timer_delete_sync to del_timer_sync on the best effort basis while still retaining del_timer() and del_timer_sync() helpers. Again, there is no functional change in all these timer rename patches.

Signed-off-by: Waiman Long longman@redhat.com