serial: amba-pl011: Switch to use hrtimer_setup()

hrtimer_setup() takes the callback function pointer as argument and
initializes the timer completely.

Replace hrtimer_init() and the open coded initialization of
hrtimer::function with the new setup mechanism.

Patch was created by using Coccinelle.

Signed-off-by: Nam Cao <namcao@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/78e8c0d1b38998eab983fad265751ed13c2b9009.1738746904.git.namcao@linutronix.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>