wifi: rt2x00: Switch to use hrtimer_setup()

hrtimer_setup() takes the callback function pointer as argument and
initializes the timer completely. This new function replaces
hrtimer_init().

However, converting this driver is not obvious: the driver calls
hrtimer_init() in rt2x00dev.c, then set the hrtimer's callback function in
rt2800mmio.c and rt2800usb.c. Therefore, switching to the new function is
not a simple one-for-one replacement.

With the lack of hardware to verify any non-trivial changes, keep it simple
and calls hrtimer_setup() with hrtimer_dummy_timeout() as callback function
pointer.

Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/f086be77528edf0dfb455af4cb984b863084a455.1738746872.git.namcao@linutronix.de

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