xen/vcpu: Use a unified name about cpu hotplug state for pv and pvhvm

As xen_cpuhp_setup is called by PV and PVHVM, the name of "x86/xen/hvm_guest"
is confusing.

Signed-off-by: Zhenzhong Duan <[e-mail]>
Reviewed-by: Boris Ostrovsky <[e-mail]>
Signed-off-by: Boris Ostrovsky <[e-mail]>

arch/x86/xen/enlighten.c

···
 	int rc;
 
 	rc = cpuhp_setup_state_nocalls(CPUHP_XEN_PREPARE,
-				       "x86/xen/hvm_guest:prepare",
+				       "x86/xen/guest:prepare",
 				       cpu_up_prepare_cb, cpu_dead_cb);
 	if (rc >= 0) {
 		rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
-					       "x86/xen/hvm_guest:online",
+					       "x86/xen/guest:online",
 					       xen_cpu_up_online, NULL);
 		if (rc < 0)
 			cpuhp_remove_state_nocalls(CPUHP_XEN_PREPARE);