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

@@ -12,6 +12,8 @@ COMMON+=cbfs-mkstage.o cbfs-mkpayload.o
 COMMON+=lzma/lzma.o
 COMMON+=lzma/C/LzFind.o  lzma/C/LzmaDec.o  lzma/C/LzmaEnc.o
 
+COMMON+=linux_trampoline.o cbfs-payload-linux.o
+
 COMMON:=$(addprefix $(obj)/,$(COMMON))
 
 all: dep $(BINARY)