x86/apic: Correctly detect X2APIC status in function enable_IR()

X2APIC will be disabled if user specifies "nox2apic" on kernel command
line, even when x2apic_preenabled is true. So correctly detect X2APIC
status by using x2apic_enabled() instead of x2apic_preenabled.

Signed-off-by: Jiang Liu <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: [email protected]
Cc: H. Peter Anvin <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: HATAYAMA Daisuke <[email protected]>
Cc: Jan Beulich <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Oren Twaig <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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