Replace the two-step hrtimer initialization pattern with a single
consolidated call to hrtimer_setup().
The legacy approach of calling hrtimer_init() followed by manual
assignment to timer.function is deprecated. The new hrtimer_setup()
helper atomically initializes the timer and assigns the callback
function in one operation, eliminating the race-prone intermediate
state where the timer is initialized but lacks a handler.
Signed-off-by: Mieczyslaw Nalewaj <[email protected]>
