flashchips: Add ISSI IS25LP064

Grabbed from mailing list, created by Simon Buhrow. Since no logs were
attached, the chip is marked as untested.

Change-Id: Idc26162fc5a5a429acef546b30b12d8b1f195e0a
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/28809
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/flashchips.h b/flashchips.h
index ecd8d7a..d17d26d 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -453,6 +453,7 @@
 
 #define ISSI_ID			0xD5	/* ISSI Integrated Silicon Solutions, see also PMC. */
 #define ISSI_ID_SPI		0x9D	/* ISSI ID used for SPI flash, see also PMC_ID_NOPREFIX */
+#define ISSI_IS25LP064		0x6017
 #define ISSI_IS25LP128		0x6018
 #define ISSI_IS25WP128		0x7018
 #define ISSI_PMC_IS29GL032B	0xF9