Document uncertainty regarding ASD chips

ASD chips may exist, but all available docs suggest they are just
rebranded Winbond chips with Winbond IDs. The ASD vendor/chip IDs in
flash.h are very likely just misinterpreted LHA headers.

Corresponding to flashrom svn r470.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

flash.h

@@ -186,6 +186,7 @@ extern struct flashchip flashchips[];
 #define AMIC_A29040B		0x86
 #define AMIC_A49LF040A		0x9d
 
+/* This chip vendor/device ID is probably a misinterpreted LHA header. */
 #define ASD_ID			0x25	/* ASD, not listed in JEP106W */
 #define ASD_AE49F2008		0x52