flashchips: Add ZD25D20

This adds another Zetta Device chip, the ZD25D20.

Change-Id: Idf805252647be44e28296a161d2e6160710bcc71
Signed-off-by: David Hendricks <david.hendricks@gmail.com>
Reviewed-on: https://review.coreboot.org/23702
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/flashchips.h b/flashchips.h
index 8c07628..452f776 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -958,6 +958,7 @@
 #define WINBOND_W49V002FA	0x32
 
 #define ZETTADEVICE_ID          0xBA	/* Zetta Device */
+#define ZETTADEVICE_ZD25D20     0x2012
 #define ZETTADEVICE_ZD25D40     0x2013
 
 #endif /* !FLASHCHIPS_H */