timekeeping: Add CLOCK ID to system_device_crosststamp

The normal capture for system/device cross timestamps is CLOCK_REALTIME,
but that's meaningless for AUX clocks.

Add a clock_id field to struct system_device_crosststamp and initialize it
with CLOCK_REALTIME at the two places which prepare for cross
timestamps.

After the related code has been cleaned up, the core code will honor the
clock_id field when calculating the system time from the system counter
snapshot.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: David Woodhouse <dwmw@amazon.co.uk>
Tested-by: Arthur Kiyanovski <akiyano@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20260529195557.482153523@kernel.org

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