KVM: x86: Move definition of X2APIC_MSR() to lapic.h

Dedup the definition of X2APIC_MSR and put it in the local APIC code
where it belongs.

No functional change intended.

Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://lore.kernel.org/r/20250610225737.156318-18-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

arch/x86/kvm/lapic.h

@@ -21,6 +21,8 @@
 #define APIC_BROADCAST			0xFF
 #define X2APIC_BROADCAST		0xFFFFFFFFul
 
+#define X2APIC_MSR(r) (APIC_BASE_MSR + ((r) >> 4))
+
 enum lapic_mode {
 	LAPIC_MODE_DISABLED = 0,
 	LAPIC_MODE_INVALID = X2APIC_ENABLE,

arch/x86/kvm/svm/svm.c

@@ -82,8 +82,6 @@ static uint64_t osvw_len = 4, osvw_status;
 
 static DEFINE_PER_CPU(u64, current_tsc_ratio);
 
-#define X2APIC_MSR(x)	(APIC_BASE_MSR + (x >> 4))
-
 static const u32 direct_access_msrs[] = {
 	MSR_STAR,
 	MSR_IA32_SYSENTER_CS,

arch/x86/kvm/vmx/vmx.h

@@ -19,8 +19,6 @@
 #include "../mmu.h"
 #include "common.h"
 
-#define X2APIC_MSR(r) (APIC_BASE_MSR + ((r) >> 4))
-
 #ifdef CONFIG_X86_64
 #define MAX_NR_USER_RETURN_MSRS	7
 #else