Drop boot directory

It only has two files, move them to src/lib

Change-Id: I17943db4c455aa3a934db1cf56e56e89c009679f
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1959
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)

src/lib/Makefile.inc

@@ -39,6 +39,8 @@ romstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
 romstage-y += compute_ip_checksum.c
 romstage-y += memmove.c
 
+ramstage-y += hardwaremain.c
+ramstage-y += selfboot.c
 ifneq ($(CONFIG_HAVE_ARCH_MEMSET),y)
 ramstage-y += memset.c
 endif