dm: Remove dependency on libuuid

Since any uuid relevant action directly uses Linux kernel UAPI
(linux/uuid.h) the use of libuuid is not required.

Tracked-On: #6688
Signed-off-by: Helmut Buchsbaum <helmut.buchsbaum@opensource.tttech-industrial.com>

devicemodel/include/timer.h

@@ -6,6 +6,7 @@
 #ifndef _TIMER_H_
 #define _TIMER_H_
 
+#include <time.h>  // for struct itimerspec
 #include <sys/param.h>
 
 struct acrn_timer {

devicemodel/include/vmmapi.h

@@ -30,7 +30,6 @@
 #define	_VMMAPI_H_
 
 #include <sys/param.h>
-#include <uuid/uuid.h>
 #include "types.h"
 #include "macros.h"
 #include "pm.h"