vz: fixed build by including necessary headers

After eaf18f4c2 some functions changed their homes
Pushed under build breaking rule

src/vz/vz_driver.c

@@ -51,6 +51,8 @@
 #include "virstring.h"
 #include "cpu/cpu.h"
 #include "virtypedparam.h"
+#include "virhostmem.h"
+#include "virhostcpu.h"
 
 #include "vz_driver.h"
 #include "vz_utils.h"

src/vz/vz_sdk.c

@@ -31,6 +31,7 @@
 #include "datatypes.h"
 #include "domain_conf.h"
 #include "virtime.h"
+#include "virhostcpu.h"
 
 #include "vz_sdk.h"