hv:fix "no prototype for non-static function"

change some APIs to static or include header file

Tracked-On: #861
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>

hypervisor/arch/x86/guest/pm.c

@@ -10,6 +10,7 @@
 #include <io.h>
 #include <logmsg.h>
 #include <platform_acpi_info.h>
+#include <guest_pm.h>
 
 int32_t validate_pstate(const struct acrn_vm *vm, uint64_t perf_ctl)
 {

hypervisor/arch/x86/seed/seed_abl.c

@@ -9,6 +9,7 @@
 #include <pgtable.h>
 #include <rtl.h>
 #include <seed.h>
+#include "seed_abl.h"
 
 #define ABL_SEED_LEN 32U
 struct abl_seed_info {

hypervisor/arch/x86/vmx.c

@@ -10,6 +10,7 @@
 #include <msr.h>
 #include <per_cpu.h>
 #include <pgtable.h>
+#include <vmx.h>
 
 /**
  * @pre addr != NULL && addr is 4KB-aligned