timekeeping/auxclock: Consistently use raw timekeeper for tk_setup_internals()

timekeeping/auxclock: Consistently use raw timekeeper for tk_setup_internals()

In aux_clock_enable() the clocksource from tkr_raw is used to call
tk_setup_internals(). Do the same in tk_aux_update_clocksource().  While
the clocksources will be the same in any case, this is less confusing.

Signed-off-by: Thomas Weißschuh (Schneider Electric) <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260311-hrtimer-cleanups-v1-4-095357392669@linutronix.de