C3: add blob-bl40.bin.signed for chipset of c302x

Change-Id: Idecc0b290af55f0198fe166d4f9d93daf1aec618
Signed-off-by: Bo Lv <bo.lv@amlogic.com>
diff --git a/c3/c302x/blob-bl40.bin.signed b/c3/c302x/blob-bl40.bin.signed
new file mode 100755
index 0000000..5245378
--- /dev/null
+++ b/c3/c302x/blob-bl40.bin.signed
Binary files differ