x86/cpu: Get rid of the smp_store_cpu_info() indirection

smp_store_cpu_info() is just a wrapper around identify_secondary_cpu()
without further value.

Move the extra bits from smp_store_cpu_info() into identify_secondary_cpu()
and remove the wrapper.

[ darwi: Make it compile and fix up the xen/smp_pv.c instance ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250304085152.51092-9-darwi@linutronix.de