Add SPI chip read support to the dummy flasher

This allows using the dummy flasher for SPI read debugging.

Corresponding to flashrom svn r1053.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Sean Nelson <audiohacked@gmail.com>
diff --git a/flash.h b/flash.h
index 13f7981..93776f1 100644
--- a/flash.h
+++ b/flash.h
@@ -454,6 +454,7 @@
 void dummy_chip_readn(uint8_t *buf, const chipaddr addr, size_t len);
 int dummy_spi_send_command(unsigned int writecnt, unsigned int readcnt,
 		      const unsigned char *writearr, unsigned char *readarr);
+int dummy_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len);
 #endif
 
 /* nic3com.c */