x86/irq: Refine the way to calculate NR_IRQS

Now we have made MSI independent of IOAPIC, so we need to refine the
way to calculate NR_IRQS to support configuration with MSI enabled but
IOAPIC disabled.

Signed-off-by: Jiang Liu <[email protected]>
Tested-by: Joerg Roedel <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: David Cohen <[email protected]>
Cc: Sander Eikelenboom <[email protected]>
Cc: David Vrabel <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dimitri Sivanich <[email protected]>
Cc: Jan Beulich <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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