spi25: Add SPI25_EEPROM enum and handle < 3-byte addresses

Change-Id: I043f6ea987a07853b8c50e34b3cd63faf995ecbc
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/314
diff --git a/include/flash.h b/include/flash.h
index 5d5efb7..67853cb 100644
--- a/include/flash.h
+++ b/include/flash.h
@@ -279,6 +279,7 @@
 		/* SPI25 is very common. Keep it at zero so we don't have
 		   to specify it for each and every chip in the database.*/
 		SPI25 = 0,
+		SPI25_EEPROM,
 		SPI95,
 		SPI_EDI,
 	} spi_cmd_set;