[][OpenWrt Dev][Add NMBM support]

[Description]
Add NMBM support

[Release-log]
N/A

Change-Id: I6a64185350eac5034d6470ecaa20761257346854
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4580547
diff --git a/target/linux/generic/files-5.4/drivers/mtd/nmbm/Makefile b/target/linux/generic/files-5.4/drivers/mtd/nmbm/Makefile
new file mode 100644
index 0000000..46e6d50
--- /dev/null
+++ b/target/linux/generic/files-5.4/drivers/mtd/nmbm/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# (C) Copyright 2020 MediaTek Inc. All rights reserved.
+
+obj-$(CONFIG_NMBM) += nmbm-core.o
+obj-$(CONFIG_NMBM_MTD) += nmbm-mtd.o