x86/apic: Wire up single IPI for x2apic_uv

The function already exists.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@alien.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Travis <travis@sgi.com>
Cc: Daniel J Blueman <daniel@numascale.com>
Link: http://lkml.kernel.org/r/20151104220849.376775625@linutronix.de

arch/x86/kernel/apic/x2apic_uv_x.c

@@ -406,6 +406,7 @@ static struct apic __refdata apic_x2apic_uv_x = {
 
 	.cpu_mask_to_apicid_and		= uv_cpu_mask_to_apicid_and,
 
+	.send_IPI			= uv_send_IPI_one,
 	.send_IPI_mask			= uv_send_IPI_mask,
 	.send_IPI_mask_allbutself	= uv_send_IPI_mask_allbutself,
 	.send_IPI_allbutself		= uv_send_IPI_allbutself,