tests: driver_pir: vtimer -> xtimer

tests/driver_pir/Makefile

@@ -12,7 +12,7 @@ ifneq (,$(filter arduino-due,$(BOARD)))
 endif
 
 USEMODULE += pir
-USEMODULE += vtimer
+USEMODULE += xtimer
 
 ifneq (,$(PIR_GPIO))
   CFLAGS += -DPIR_GPIO=$(PIR_GPIO)

tests/driver_pir/main.c

@@ -25,7 +25,7 @@
 #include <stdio.h>
 
 #include "thread.h"
-#include "vtimer.h"
+#include "xtimer.h"
 #include "pir.h"
 
 char pir_handler_stack[THREAD_STACKSIZE_MAIN];
@@ -75,7 +75,7 @@ int main(void)
     puts("Printing sensor state every second.");
     while (1) {
         printf("Status: %s\n", pir_get_status(&dev) == PIR_STATUS_LO ? "lo" : "hi");
-        vtimer_usleep(1000 * 1000);
+        xtimer_usleep(1000 * 1000);
     }
 #else
    thread_create(