Added Mattel to OEMs list

Change-Id: I8723e48b23698c6ecdb18498e1470af482d20f0e
diff --git a/_oem/mattel.markdown b/_oem/mattel.markdown
new file mode 100644
index 0000000..bef0b3d
--- /dev/null
+++ b/_oem/mattel.markdown
@@ -0,0 +1,4 @@
+---
+layout: device
+oem: Mattel
+---