cbfs: remove prepare() callback from struct cbfs_locator

The prepare() callback is no longer utilized in the code. Remove
the callback and support for it.

Change-Id: Ic438e5a80850a3df619dbbfdecb522a9dc2c1949
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36690
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Wim Vervoorn <wvervoorn@eltan.com>

src/include/cbfs.h

@@ -79,16 +79,10 @@ int cbfs_default_props(struct cbfs_props *props);
 /* Return < 0 on error otherwise props are filled out accordingly. */
 int cbfs_boot_region_properties(struct cbfs_props *props);
 
-/* Allow external logic to take action prior to locating a program
- * (stage or payload). */
-void cbfs_prepare_program_locate(void);
-
 /* Object used to identify location of current cbfs to use for cbfs_boot_*
- * operations. It's used by cbfs_boot_region_properties() and
- * cbfs_prepare_program_locate(). */
+ * operations. It's used by cbfs_boot_region_properties(). */
 struct cbfs_locator {
 	const char *name;
-	void (*prepare)(void);
 	/* Returns 0 on successful fill of cbfs properties. */
 	int (*locate)(struct cbfs_props *props);
 };