KVM: Order segment register constants in the same way as cpu operand encoding

This can be used to simplify the x86 instruction decoder.
Signed-off-by: NAvi Kivity <avi@qumranet.com>

include/asm-x86/kvm_host.h

@@ -109,12 +109,12 @@ enum {
 };
 
 enum {
+	VCPU_SREG_ES,
 	VCPU_SREG_CS,
+	VCPU_SREG_SS,
 	VCPU_SREG_DS,
-	VCPU_SREG_ES,
 	VCPU_SREG_FS,
 	VCPU_SREG_GS,
-	VCPU_SREG_SS,
 	VCPU_SREG_TR,
 	VCPU_SREG_LDTR,
 };