efi_loader: bootmgr: make BootNext non-volatile

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
index 4379142..b2102c5 100644
--- a/lib/efi_loader/efi_bootmgr.c
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -210,7 +210,8 @@
 		ret = EFI_CALL(efi_set_variable(
 					L"BootNext",
 					(efi_guid_t *)&efi_global_variable_guid,
-					0, 0, &bootnext));
+					EFI_VARIABLE_NON_VOLATILE, 0,
+					&bootnext));
 
 		/* load BootNext */
 		if (ret == EFI_SUCCESS) {