timekeeping: Add auxiliary clock support to __timekeeping_inject_offset()

timekeeping: Add auxiliary clock support to __timekeeping_inject_offset()

Redirect the relative offset adjustment to the auxiliary clock offset
instead of modifying CLOCK_REALTIME, which has no meaning in context of
these clocks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20250625183758.124057787@linutronix.de