x86/apic/uv: Fix inconsistent destination mode

The UV x2apic is strictly using physical destination mode, but
apic::dest_logical is initialized with APIC_DEST_LOGICAL.

This does not matter much because UV does not use any of the generic
functions which use apic::dest_logical, but is still inconsistent.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201024213535.443185-4-dwmw2@infradead.org