Add a Makefile in the rtase folder to build rtase driver.

Signed-off-by: Justin Lai <justinlai0215@realtek.com>
---
 drivers/net/ethernet/realtek/rtase/Makefile | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 drivers/net/ethernet/realtek/rtase/Makefile

diff --git a/drivers/net/ethernet/realtek/rtase/Makefile b/drivers/net/ethernet/realtek/rtase/Makefile
new file mode 100644
index 000000000000..f29b14687950
--- /dev/null
+++ b/drivers/net/ethernet/realtek/rtase/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+# Copyright(c) 2023 Realtek Semiconductor Corp. All rights reserved.
+
+#
+# Makefile for the Realtek PCIe driver
+#
+
+obj-$(CONFIG_RTASE) += rtase.o
+
+rtase-objs := rtase_main.o
-- 
2.34.1