Add definitions for the EFI device tree table

Add definitions for the EFI device tree table, as specified in UEFI
specification 2.9 (March 2021).

Signed-off-by: Alfonso Sánchez-Beato <alfonso.sanchez-beato@canonical.com>

inc/efiapi.h

@@ -935,6 +935,8 @@ typedef struct _EFI_BOOT_SERVICES {
 #define SAL_SYSTEM_TABLE_GUID    \
     { 0xeb9d2d32, 0x2d88, 0x11d3, {0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d} }
 
+#define EFI_DTB_TABLE_GUID \
+    { 0xb1b621d5, 0xf19c, 0x41a5, {0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0} }
 
 typedef struct _EFI_CONFIGURATION_TABLE {
     EFI_GUID                VendorGuid;

inc/efilib.h

@@ -155,6 +155,7 @@ extern EFI_GUID AcpiTableGuid;
 extern EFI_GUID SMBIOSTableGuid;
 extern EFI_GUID SMBIOS3TableGuid;
 extern EFI_GUID SalSystemTableGuid;
+extern EFI_GUID EfiDtbTableGuid;
 
 extern EFI_GUID SimplePointerProtocol;
 extern EFI_GUID AbsolutePointerProtocol;

lib/data.c

@@ -181,6 +181,7 @@ EFI_GUID AcpiTableGuid            = ACPI_TABLE_GUID;
 EFI_GUID SMBIOSTableGuid          = SMBIOS_TABLE_GUID;
 EFI_GUID SMBIOS3TableGuid         = SMBIOS3_TABLE_GUID;
 EFI_GUID SalSystemTableGuid       = SAL_SYSTEM_TABLE_GUID;
+EFI_GUID EfiDtbTableGuid          = EFI_DTB_TABLE_GUID;
 
 //
 // Network protocol GUIDs