efi_loader: rename Unicode collation protocol 2 variables

Rename variables to make it clear they refer to the Unicode collation
protocol identified by the EFI_UNICODE_PROTOCOL2_GUID.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 07ef14b..835007e1 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -108,7 +108,7 @@
 					efi_device_path_utilities;
 /* Implementation of the EFI_UNICODE_COLLATION_PROTOCOL */
 extern const struct efi_unicode_collation_protocol
-					efi_unicode_collation_protocol;
+					efi_unicode_collation_protocol2;
 extern const struct efi_hii_config_routing_protocol efi_hii_config_routing;
 extern const struct efi_hii_config_access_protocol efi_hii_config_access;
 extern const struct efi_hii_database_protocol efi_hii_database;
@@ -146,7 +146,7 @@
 extern const efi_guid_t efi_file_system_info_guid;
 extern const efi_guid_t efi_guid_device_path_utilities_protocol;
 /* GUID of the Unicode collation protocol */
-extern const efi_guid_t efi_guid_unicode_collation_protocol;
+extern const efi_guid_t efi_guid_unicode_collation_protocol2;
 extern const efi_guid_t efi_guid_hii_config_routing_protocol;
 extern const efi_guid_t efi_guid_hii_config_access_protocol;
 extern const efi_guid_t efi_guid_hii_database_protocol;