tools: start burn_my_bmc tool

Start implementation of burn_my_bmc host tool, the purpose of which is
to upload the firmware image and trigger the verification process.

The utility will accept four parameters:
1) command - the command to run, initially only "update"
2) interface - the data interface to use, e.g. lpc or pci
3) image - the path to the image file
4) sig - the path to the image's signature file

Change-Id: Ifbab7df947f37dd3a6fddddcf523c0fa724c9551
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index c13c7cc..ae38b8a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,3 +48,4 @@
 # Custom generated files
 
 # Output binaries
+burn_my_bmc