[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/bsp/lk/project/target/stm32f746g-disco.mk b/src/bsp/lk/project/target/stm32f746g-disco.mk
new file mode 100644
index 0000000..7c39ac4
--- /dev/null
+++ b/src/bsp/lk/project/target/stm32f746g-disco.mk
@@ -0,0 +1,3 @@
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+TARGET := stm32f746g-disco