x86, apic: Remove enable_apic_mode callback

The enable_apic_mode() apic callback is never called, so remove it.

Signed-off-by: David Rientjes <rientjes@google.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1407302352320.17503@chino.kir.corp.google.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --cc arch/x86/include/asm/apic.h
Simple merge

diff --cc arch/x86/kernel/apic/apic.c
Simple merge

diff --cc arch/x86/kernel/apic/apic_flat_64.c
Simple merge

diff --cc arch/x86/kernel/apic/apic_noop.c
Simple merge

diff --cc arch/x86/kernel/apic/apic_numachip.c
Simple merge

diff --cc arch/x86/kernel/apic/bigsmp_32.c
Simple merge

diff --cc arch/x86/kernel/apic/probe_32.c
Simple merge

diff --cc arch/x86/kernel/apic/x2apic_cluster.c
Simple merge

diff --cc arch/x86/kernel/apic/x2apic_phys.c
Simple merge

diff --cc arch/x86/kernel/apic/x2apic_uv_x.c
Simple merge