Patch merged into coreboot/master: util/nvidia/cbootimage: update to latest master

the following patch was just integrated into master:
commit d7f6bd586098b2e3a3811f23e596d8c46a66182a
Author: Patrick Georgi 
Date:   Mon Mar 14 17:16:33 2016 +0100

util/nvidia/cbootimage: update to latest master

This includes a fix that allows using cbootimage with paths containing
    the "@" sign, which happens sometimes in jenkins configurations.

Change-Id: I83154afa35b6d24449e713e57031b1a93d7ac748
    Signed-off-by: Patrick Georgi 
    Reviewed-on: https://review.coreboot.org/14090
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/14090 for details.

-gerrit