vm load: fix bug in loading kernel

According to the explaination for pref_address
in Documentation/x86/boot.txt, a relocating bootloader
should attempt to load kernel at pref_address if possible.
But due to a non-relocatable kernel will unconditionally
move itself and to run at perf address, no need to copy
kernel to perf_address by bootloader.

Signed-off-by: Zheng, Gen <gen.zheng@intel.com>

hypervisor/arch/x86/guest/guest.c

@@ -37,6 +37,7 @@
 #include <acrn_hv_defs.h>
 #include <hv_debug.h>
 #include <multiboot.h>
+#include <zeropage.h>
 
 #define ACRN_DBG_GUEST	6