efi_loader: 'EFI using ACPI tables at' should be debug message

The message "EFI using ACPI tables at %lx\n" is only of interest when
debugging. Make it a debug message.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/lib/efi_loader/efi_acpi.c b/lib/efi_loader/efi_acpi.c
index 67bbd2a..67bd7f8 100644
--- a/lib/efi_loader/efi_acpi.c
+++ b/lib/efi_loader/efi_acpi.c
@@ -41,7 +41,7 @@
 	}
 
 	addr = gd_acpi_start();
-	printf("EFI using ACPI tables at %lx\n", addr);
+	log_debug("EFI using ACPI tables at %lx\n", addr);
 
 	/* And expose them to our EFI payload */
 	return efi_install_configuration_table(&acpi_guid,