ignore now-built-from-source ddr3_training_a38x.lib

Change-Id: I19b582f1b9f978c16eaef7f4acd86d32a9d42df9
diff --git a/tools/marvell/bin_hdr/src_ddr/lib/.gitignore b/tools/marvell/bin_hdr/src_ddr/lib/.gitignore
new file mode 100644
index 0000000..65b7ee2
--- /dev/null
+++ b/tools/marvell/bin_hdr/src_ddr/lib/.gitignore
@@ -0,0 +1 @@
+ddr3_training_a38x.lib