Add ts5300 flag as comment utility Makefile

Corresponding to flashrom svn r49 and coreboot v2 svn r2215.
diff --git a/Makefile b/Makefile
index c269229..770aa0e 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@
 CC      = gcc
 STRIP	= strip
 #CFLAGS  = -O2 -g -Wall -Werror
-CFLAGS  = -Os -Wall -Werror -DDISABLE_DOC
+CFLAGS  = -Os -Wall -Werror -DDISABLE_DOC # -DTS5300
 LDFLAGS = -lpci -static