S4D: add S805X2S blob-bl40.bin.signed

Change-Id: I63dce4c0a4b511bf7c51848d98213b3a509fe959
diff --git a/s4/s805x2s/blob-bl40.bin.signed b/s4/s805x2s/blob-bl40.bin.signed
new file mode 100644
index 0000000..98f130a
--- /dev/null
+++ b/s4/s805x2s/blob-bl40.bin.signed
Binary files differ