Patch merged into coreboot/master: payloads/depthcharge: Specify revision to build

the following patch was just integrated into master:
commit f9973b5c2bf9ec09c72579e152a2aefee3b6dd85
Author: Marshall Dawson 
Date:   Thu Dec 22 18:16:48 2016 -0500

payloads/depthcharge: Specify revision to build

Add the capability for specifying which version of depthcharge to
    checkout and build.  This is similar to the existing feature for
    SeaBIOS.

The depthcharge makefile already contains some structure for checking
    out master vs. stable however the calling Makefile.inc ingored this
    feature.  Add the command-line variable assignment for these, along
    with a tree-ish for any revision.

Change-Id: I99a5b088cb0ebb29e5d96a84217b3bfa852de8ac
    Signed-off-by: Marshall Dawson 
    Reviewed-on: https://review.coreboot.org/18270
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Martin Roth

See https://review.coreboot.org/18270 for details.

-gerrit