Generify a25.c's SRWD printing function and move it to spi25.c

Corresponding to flashrom svn r1602.

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 ea6c35f..1ef4959 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -53,6 +53,7 @@
 int spi_write_status_register(struct flashctx *flash, int status);
 void spi_prettyprint_status_register_bit(uint8_t status, int bit);
 void spi_prettyprint_status_register_bp(uint8_t status, int bp);
+void spi_prettyprint_status_register_srwd(uint8_t status);
 void spi_prettyprint_status_register_welwip(uint8_t status);
 int spi_prettyprint_status_register(struct flashctx *flash);
 int spi_disable_blockprotect(struct flashctx *flash);