Add support for the SST25VF040B 4 Mbit SPI flash chip

Straight from the data sheet, not tested.

Corresponding to flashrom svn r175 and coreboot v2 svn r3036.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>

flashchips.c

@@ -52,6 +52,8 @@ struct flashchip flashchips[] = {
 	 probe_29f002,	erase_29f002, 	write_29f002},
 	{"MX25L4005",	MX_ID,		MX_25L4005,	512, 256,
 	 probe_spi,	generic_spi_chip_erase_c7,	generic_spi_chip_write},
+	{"SST25VF040B",	SST_ID,		SST_25VF040B,	512,	256,
+	probe_spi,	generic_spi_chip_erase_c7,	generic_spi_chip_write},
 	{"SST25VF016B",	SST_ID,		SST_25VF016B,	2048,	256,
 	probe_spi,	generic_spi_chip_erase_c7,	generic_spi_chip_write},
 	{"SST29EE020A", SST_ID,		SST_29EE020A,	256, 128,