util/ifdtool: add option to dump flashrom layout

Dump the Intel Flash Descriptor map in the format expected
by flashrom's "layout" option.

Example usage:

Given a 4MB flash image vpx7654.bin that was generated by Intel's
FITC tool for a 6-Series chipset...

./ifdtool --layout l.txt vpx7654.bin
cat l.txt
	00000000:00000fff fd
	00180000:003fffff bios
	00001000:0017ffff me
	00fff000:00000fff gbe
	00fff000:00000fff pd

Change-Id: Ib740178ed6935b5f6e1dba1be674303f9f980429
Signed-off-by: Christopher Douglass <cdouglass.orion@gmail.com>
Reviewed-on: http://review.coreboot.org/5306
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/ifdtool/ifdtool.h

@@ -20,6 +20,8 @@
 #include <stdint.h>
 #define IFDTOOL_VERSION "1.1"
 
+#define LAYOUT_LINELEN 80
+
 enum spi_frequency {
 	SPI_FREQUENCY_20MHZ = 0,
 	SPI_FREQUENCY_33MHZ = 1,
@@ -109,3 +111,8 @@ typedef struct {
 typedef struct {
 	int base, limit, size;
 } region_t;
+
+struct region_name {
+	char *pretty;
+	char *terse;
+};