Add chunked write ability to the Dediprog SF100 driver

Please note that the write speedup only applies to chips which have SPI
page write (i.e. chips using spi_chip_write_256).

This is a quick fix for write speed until I get around to implementing
full bulk SPI write support.

Corresponding to flashrom svn r1235.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Richard A. Smith  <richard@laptop.org>
Acked-by: Mathias Krause <mathias.krause@secunet.com>
diff --git a/programmer.h b/programmer.h
index ed9d0b2..a447092 100644
--- a/programmer.h
+++ b/programmer.h
@@ -472,6 +472,7 @@
 int dediprog_shutdown(void);
 int dediprog_spi_send_command(unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr);
 int dediprog_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len);
+int dediprog_spi_write_256(struct flashchip *flash, uint8_t *buf, int start, int len);
 
 /* flashrom.c */
 struct decode_sizes {