x86, irq: Prefer assigned ID in APIC ID register for x86_64

Perfer the assigned ID in APIC ID register for x86_64 if it's still
available.

[ tglx: Added comments ]

Signed-off-by: Yinghai Lu <[email protected]>
Signed-off-by: Jiang Liu <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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