amdfwtool: Add amdfwtool to combine AMD firmwares

Combine all needed AMD firmware into one single firmware, which going to
be added as one single CBFS module.

Change-Id: Ib044098c1837592b8f7e9c6a7da4ba3a32117e25
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/12419
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
3 files changed