kvm/x86: Remove redundant function implementations

pic_in_kernel(), ioapic_in_kernel() and irqchip_kernel() have the
same implementation.

Signed-off-by: Peng Hao <richard.peng@oppo.com>
Message-Id: <HKAPR02MB4291D5926EA10B8BFE9EA0D3E0B70@HKAPR02MB4291.apcprd02.prod.outlook.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 2a3b574..34a7e05 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -36,6 +36,7 @@
 #include <linux/jump_label.h>
 #include "kvm_cache_regs.h"
 #include "irq.h"
+#include "ioapic.h"
 #include "trace.h"
 #include "x86.h"
 #include "cpuid.h"