Add a (b)zImage parser to cbfstool

In the great tradition of LinuxBIOS this allows adding
a kernel as payload. add-payload is extended to also
allow adding an initial ramdisk (-I filename) and a
command line (-C console=ttyS0).

Change-Id: Iaca499a98b0adf0134e78d6bf020b6531a626aaa
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/3302
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

util/cbfstool/Makefile.inc

@@ -11,6 +11,9 @@ cbfsobj += lzma.o
 cbfsobj += LzFind.o
 cbfsobj += LzmaDec.o
 cbfsobj += LzmaEnc.o
+# linux as payload
+cbfsobj += linux_trampoline.o
+cbfsobj += cbfs-payload-linux.o
 
 CBFSTOOLFLAGS=-D_7ZIP_ST -g