[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/devtools/mrdump/mrdump_tool_source/mrdump_defaults.h b/src/devtools/mrdump/mrdump_tool_source/mrdump_defaults.h
new file mode 100644
index 0000000..2e93b26
--- /dev/null
+++ b/src/devtools/mrdump/mrdump_tool_source/mrdump_defaults.h
@@ -0,0 +1,2 @@
+extern const char* sysenv_get(const char *name);
+extern int sysenv_set(const char *name, const char *value);