arch/x86: Link walkcbfs.S instead on including it in bootblock.S

The code flow doesn't fall through to walkcbfs, as it does in the rest
of bootblock.S. Instead, walkcbfs is called (albeit via a jmp). The
linker cannot know this when walkcbfs.S is included directly.

When we use a CAR bootblock, we lose several hundred bytes because
walkcbfs is not garbage-collected, yet it isn't used. This problem
is solved by assembling walkcbfs.S separately, and linking it.

Change-Id: Ib3a976db09b9ff270b7677cb4f9db80b0b025e22
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/11785
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/arch/x86/Makefile.inc

@@ -85,6 +85,7 @@ endif
 # the right order. Make sure the auto generated bootblock.inc is a proper
 # dependency. Make the same true for the linker sript.
 bootblock-y += bootblock.S
+bootblock-y += walkcbfs.S
 $(obj)/arch/x86/bootblock.bootblock.o: $(objgenerated)/bootblock.inc
 
 bootblock-y += bootblock.ld