flashchips: Add Fudan FM25Q64, update FM25Q08..Q32

For all bits that matter to us,  these chips seem to have the same
status-register layout. The FM25Q64 differs in a few bits that are
out-of-scope, and additionally supports a WRSR2.

Datasheets used:
http://eng.fmsh.com/nvm/FM25Q08_ds_eng.pdf
http://eng.fmsh.com/nvm/FM25Q16_ds_eng.pdf
http://eng.fmsh.com/nvm/FM25Q32_ds_eng.pdf
http://eng.fmsh.com/nvm/FM25Q64_ds_eng.pdf

Change-Id: I820ed60366d19ab4d87f8c02b4018ffb5591ca5f
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/288
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/include/flashchips.h b/include/flashchips.h
index 0fa1afe..4718bd2 100644
--- a/include/flashchips.h
+++ b/include/flashchips.h
@@ -353,6 +353,7 @@
 #define FUDAN_FM25Q08		0x4014
 #define FUDAN_FM25Q16		0x4015
 #define FUDAN_FM25Q32		0x4016
+#define FUDAN_FM25Q64		0x4017
 
 #define FUJITSU_ID		0x04	/* Fujitsu */
 #define FUJITSU_MBM29DL400BC	0x0F