Add support for SST39SF040, SST39SF010A and W39V040B

Corresponding to flashrom svn r58 and coreboot v2 svn r2354.
diff --git a/flash_enable.c b/flash_enable.c
index d03a36b..ccd670a 100644
--- a/flash_enable.c
+++ b/flash_enable.c
@@ -398,6 +398,7 @@
         {0x10de, 0x0050, "NVIDIA CK804", enable_flash_ck804}, // LPC
         {0x10de, 0x0051, "NVIDIA CK804", enable_flash_ck804}, // Pro
         {0x10de, 0x00d3, "NVIDIA CK804", enable_flash_ck804}, // Slave, should not be here, to fix known bug for A01.
+	{0x10de, 0x0261, "NVIDIA C51",   enable_flash_ck804},
 	{0x1002, 0x4377, "ATI SB400", enable_flash_sb400}, // ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80)
 };