nvramtool: Unify nvramtool and build_opt_tbl

As cmos.layout parsing capabilities are already there in nvramtool,
use those than using build_opt_tbl.c. Add binary and header file
generation in nvramtool. Make appropriate changes to Makefile.inc.

Change-Id: Iaf3f5d4f51451aeb33c92800a0c895045f2388cf
Signed-off-by: Vikram Narayanan <vikram186@gmail.com>
Reviewed-on: http://review.coreboot.org/898
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/util/nvramtool/common.c b/util/nvramtool/common.c
index 91fcccc..15f8b0d 100644
--- a/util/nvramtool/common.c
+++ b/util/nvramtool/common.c
@@ -98,6 +98,8 @@
 		"VALUE.\n"
 		"       -l [ARG]:       Show coreboot table info for ARG, or "
 		"all ARG choices.\n"
+		"       -L OUTPUT_BIN   Write CMOS layout file in binary format\n"
+		"       -H OUTPUT_HDR   Write CMOS layout file in header format\n"
 		"       -d:             Show low-level dump of coreboot table.\n"
 		"       -Y:             Show CMOS layout info.\n"
 		"       -b OUTPUT_FILE: Dump CMOS memory contents to file.\n"