Add Am29LV040B

Looking through the sources of Uniflash utility I found that this chip
is no more no less than low-voltage variant of Am29F040B but with
different ID.

So I created a very quick patch (attached).

Corresponding to flashrom svn r157 and coreboot v2 svn r2897.
Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Acked-by: Peter Stuge <peter@stuge.se>

flash.h

@@ -63,6 +63,7 @@ extern struct flashchip flashchips[];
 
 #define AMD_ID			0x01	/* AMD */
 #define AM_29F040B		0xA4
+#define AM_29LV040B		0x4F
 #define AM_29F016D		0xAD
 
 #define AMIC_ID			0x37	/* AMIC */

flashchips.c

@@ -28,6 +28,8 @@
 struct flashchip flashchips[] = {
 	{"Am29F040B",	AMD_ID, 	AM_29F040B,	512, 64 * 1024,
 	 probe_29f040b, erase_29f040b,	write_29f040b},
+	{"Am29LV040B",	AMD_ID, 	AM_29LV040B,	512, 64 * 1024,
+	 probe_29f040b, erase_29f040b,	write_29f040b},
 	{"Am29F016D",	AMD_ID, 	AM_29F016D,	2048, 64 * 1024,
 	 probe_29f040b, erase_29f040b,	write_29f040b},
 	{"AE49F2008",	ASD_ID,	        ASD_AE49F2008,	256, 128,