x86: L-APIC: Always fully configure IRQ0

Unlike the 32-bit one, the 64-bit variation of the LVT0 setup code for
the "8259A Virtual Wire" through the local APIC timer configuration does
not fully configure the relevant irq_chip structure.  Instead it relies on
the preceding I/O APIC code to have set it up, which does not happen if
the I/O APIC variants have not been tried.

The patch includes corresponding changes to the 32-bit variation too
which make them both the same, barring a small syntactic difference
involving sequence of functions in the source.  That should work as an aid
with the upcoming merge.

Signed-off-by: Maciej W. Rozycki <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Matthew Garrett <[email protected]>
Cc: Andreas Herrmann <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

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