Fix build with CMOS support on various platforms

When bringing in nvramtool as build_opt_tbl replacement,
various platforms where left in the cold that don't
provide direct IO support from userland (or at least not
in a way we support).

Build nvramtool without CMOS support when done as part of
a coreboot build. We don't need to touch CMOS in this case.

Change-Id: Icc88d1d32f10384867a5d44b065f9aa119bb0d50
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/983
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>

util/nvramtool/Makefile

@@ -24,7 +24,7 @@ CC      = gcc
 STRIP	= strip
 INSTALL = /usr/bin/install
 PREFIX  = /usr/local
-CFLAGS  = -O2 -g -Wall -W -I.
+CFLAGS  = -O2 -g -Wall -W -I. -DCMOS_HAL=1
 #CFLAGS  = -Os -Wall
 
 CLI_OBJS = cli/nvramtool.o cli/opts.o