layout: Add a method to cleanup layout data structures

Add layout_cleanup() to layout.c and hook it up in cli_classic.c.

Corresponding to flashrom svn r1749.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/flash.h b/flash.h
index 63701ed..7b88477 100644
--- a/flash.h
+++ b/flash.h
@@ -320,6 +320,7 @@
 int process_include_args(void);
 int read_romlayout(char *name);
 int handle_romentries(const struct flashctx *flash, uint8_t *oldcontents, uint8_t *newcontents);
+void layout_cleanup(void);
 
 /* spi.c */
 struct spi_command {