Add support for a bunch of 29GL parallel flash chips

29GL chips use a new 3-Byte device ID probing function at addresses
0x01, 0x0E, 0x0F.

Flash chip families supported by this method include...
 - EON EN29GL
 - Gigadevice GD29GL (if they really exist)
 - ISSI (PMC) IS29GL
 - Macronix MX29GL (+MX68GL1G0F)
 - Spansion S29GL (+S70GL02G)
 - Winbond W29GL

This patch adds respective flash chip definitions for chips up to 16 MB from
Eon, ISSI, Macronix and Winbond. Bigger chips as well as those from
Gigadevice and Spansion are left out.

Corresponding to flashrom svn r1835.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
diff --git a/chipdrivers.h b/chipdrivers.h
index 57b1340..4ece42e 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -139,6 +139,7 @@
 void toggle_ready_jedec(const struct flashctx *flash, chipaddr dst);
 void data_polling_jedec(const struct flashctx *flash, chipaddr dst, uint8_t data);
 int probe_jedec(struct flashctx *flash);
+int probe_jedec_29gl(struct flashctx *flash);
 int write_jedec(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len);
 int write_jedec_1(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len);
 int erase_sector_jedec(struct flashctx *flash, unsigned int page, unsigned int pagesize);