hv: modularization: avoid dependency of multiboot on zeropage.h.

Split off definition of "struct efi_info" into a separate header
file lib/efi.h.

Tracked-On: #5661
Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>

hypervisor/arch/x86/trampoline.c

@@ -10,6 +10,7 @@
 #include <trampoline.h>
 #include <reloc.h>
 #include <ld_sym.h>
+#include <e820.h>
 
 static uint64_t trampoline_start16_paddr;
 

hypervisor/boot/include/multiboot.h

@@ -41,7 +41,7 @@
 
 #ifndef ASSEMBLER
 
-#include <zeropage.h>
+#include <efi.h>
 #include <vm_configurations.h>
 
 struct multiboot_mmap {

hypervisor/include/arch/x86/zeropage.h

@@ -7,17 +7,7 @@
 #ifndef ZEROPAGE_H
 #define ZEROPAGE_H
 #include <e820.h>
-
-struct efi_info {
-	uint32_t efi_loader_signature;	/* 0x1d0 */
-	uint32_t efi_systab;		/* 0x1c4 */
-	uint32_t efi_memdesc_size;	/* 0x1c8 */
-	uint32_t efi_memdesc_version;	/* 0x1cc */
-	uint32_t efi_memmap;		/* 0x1d0 */
-	uint32_t efi_memmap_size;	/* 0x1d4 */
-	uint32_t efi_systab_hi;		/* 0x1d8 */
-	uint32_t efi_memmap_hi;		/* 0x1dc */
-} __packed;
+#include <efi.h>
 
 struct zero_page {
 	uint8_t pad0[0x1c0];	/* 0x000 */

hypervisor/include/lib/efi.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2020 Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef EFI_H
+#define EFI_H
+
+struct efi_info {
+	uint32_t efi_loader_signature;	/* 0x1c0 */
+	uint32_t efi_systab;		/* 0x1c4 */
+	uint32_t efi_memdesc_size;	/* 0x1c8 */
+	uint32_t efi_memdesc_version;	/* 0x1cc */
+	uint32_t efi_memmap;		/* 0x1d0 */
+	uint32_t efi_memmap_size;	/* 0x1d4 */
+	uint32_t efi_systab_hi;		/* 0x1d8 */
+	uint32_t efi_memmap_hi;		/* 0x1dc */
+} __packed;
+
+#endif