Correct SPL use of EFI_TCG2_PROTOCOL

This converts 1 usage of this option to the non-SPL form, since there is
no SPL_EFI_TCG2_PROTOCOL defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c
index eaf75a5..26df0da 100644
--- a/lib/efi_loader/efi_image_loader.c
+++ b/lib/efi_loader/efi_image_loader.c
@@ -938,7 +938,7 @@
 		goto err;
 	}
 
-#if CONFIG_IS_ENABLED(EFI_TCG2_PROTOCOL)
+#if IS_ENABLED(CONFIG_EFI_TCG2_PROTOCOL)
 	/* Measure an PE/COFF image */
 	ret = tcg2_measure_pe_image(efi, efi_size, handle, loaded_image_info);
 	if (ret == EFI_SECURITY_VIOLATION) {