tools arch kvm: Sync kvm headers with the kernel sources

To pick up the changes from:

83d31e5271ac ("KVM: nVMX: fixes for preemption timer migration")

That don't entail changes in tooling.

This silences these tools/perf build warnings:

Warning: Kernel ABI header at 'tools/arch/x86/include/uapi/asm/kvm.h' differs from latest version at 'arch/x86/include/uapi/asm/kvm.h'
diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h

Cc: Adrian Hunter <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Paolo Bonzini <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/arch/x86/include/uapi/asm/kvm.h

···
 };
 
 struct kvm_vmx_nested_state_hdr {
-	__u32 flags;
 	__u64 vmxon_pa;
 	__u64 vmcs12_pa;
-	__u64 preemption_timer_deadline;
 
 	struct {
 		__u16 flags;
 	} smm;
+
+	__u32 flags;
+	__u64 preemption_timer_deadline;
 };
 
 struct kvm_svm_nested_state_data {