hv: refine the address used in sbl multiboot code

Update the structure definition to define the address type
(HVA vs HPA vs GPA) explicitly.

Convert address to HVA before access the GPA/HPA type of address.

Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>

hypervisor/include/hypervisor.h

@@ -34,6 +34,7 @@
 #define HVA2HPA(x) ((uint64_t)(x))
 /* gpa --> hpa -->hva */
 #define GPA2HVA(vm, x) HPA2HVA(gpa2hpa(vm, x))
+#define HVA2GPA(vm, x) hpa2gpa(vm, HVA2HPA(x))
 #endif	/* !ASSEMBLER */
 
 #endif /* HYPERVISOR_H */