hv:cleanup header file for vm.c & vm.h

-- now hypervisor.h is the universal set of header file,
   this patch doesn't include hypervisor.h, only include
   some necessary header files for vm.c and vm.h
-- move 'struct vcpuid_entry' from vm.h to vcpuid.h
-- remove dead code 'enum vm_privilege_level'
-- move 'enum vpic_wire_mode' from vm.h to vpic.h

Tracked-On: #1842
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/include/dm/vioapic.h

@@ -38,6 +38,7 @@
  */
 
 #include <apicreg.h>
+#include <util.h>
 
 #define	VIOAPIC_BASE	0xFEC00000UL
 #define	VIOAPIC_SIZE	4096UL

hypervisor/include/dm/vpic.h

@@ -95,6 +95,13 @@
 #define NR_VPIC_PINS_PER_CHIP	8U
 #define NR_VPIC_PINS_TOTAL	16U
 
+enum vpic_wire_mode {
+	VPIC_WIRE_INTR = 0,
+	VPIC_WIRE_LAPIC,
+	VPIC_WIRE_IOAPIC,
+	VPIC_WIRE_NULL
+};
+
 enum vpic_trigger {
 	EDGE_TRIGGER,
 	LEVEL_TRIGGER