Introduce helpers.c

Move some suitable functions there, add it to the Makefile, but leave the
declarations in flash.h for now.

Corresponding to flashrom svn r1819.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/Makefile b/Makefile
index d3c1ba5..7a48889 100644
--- a/Makefile
+++ b/Makefile
@@ -353,7 +353,7 @@
 ###############################################################################
 # Library code.
 
-LIB_OBJS = layout.o flashrom.o udelay.o programmer.o
+LIB_OBJS = layout.o flashrom.o udelay.o programmer.o helpers.o
 
 ###############################################################################
 # Frontend related stuff.