[Feature]Upload Modem source code

Change-Id: Id4294f30faced84d3e6fd6d5e61e1111bf287a37
diff --git a/mcu/tools/sw_binding_key.ini b/mcu/tools/sw_binding_key.ini
new file mode 100644
index 0000000..9b7859d
--- /dev/null
+++ b/mcu/tools/sw_binding_key.ini
@@ -0,0 +1 @@
+root_key      = "0x34333231, 0x38373635, 0x32313039, 0x00353433"