mips: mtmips: add support for mt7628-rfb

This patch adds support for mt7628 reference board. SPL_DM and DT are not
enabled for SPL to save about 17KiB for u-boot-spl.bin.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
diff --git a/board/mediatek/mt7628/Kconfig b/board/mediatek/mt7628/Kconfig
new file mode 100644
index 0000000..d6b6f9d
--- /dev/null
+++ b/board/mediatek/mt7628/Kconfig
@@ -0,0 +1,12 @@
+if BOARD_MT7628_RFB
+
+config SYS_BOARD
+	default "mt7628"
+
+config SYS_VENDOR
+	default "mediatek"
+
+config SYS_CONFIG_NAME
+	default "mt7628"
+
+endif
diff --git a/board/mediatek/mt7628/MAINTAINERS b/board/mediatek/mt7628/MAINTAINERS
new file mode 100644
index 0000000..032fd0e
--- /dev/null
+++ b/board/mediatek/mt7628/MAINTAINERS
@@ -0,0 +1,7 @@
+MT7628_RFB BOARD
+M:	Weijie Gao <weijie.gao@mediatek.com>
+S:	Maintained
+F:	board/mediatek/mt7628
+F:	include/configs/mt7628.h
+F:	configs/mt7628_rfb_defconfig
+F:	arch/mips/dts/mediatek,mt7628-rfb.dts
diff --git a/board/mediatek/mt7628/Makefile b/board/mediatek/mt7628/Makefile
new file mode 100644
index 0000000..db129c5
--- /dev/null
+++ b/board/mediatek/mt7628/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-y += board.o
diff --git a/board/mediatek/mt7628/board.c b/board/mediatek/mt7628/board.c
new file mode 100644
index 0000000..f837a06
--- /dev/null
+++ b/board/mediatek/mt7628/board.c
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <common.h>