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/lib/cbfs.c

@@ -359,16 +359,3 @@ int cbfs_boot_region_properties(struct cbfs_props *props)
 
 	return -1;
 }
-
-void cbfs_prepare_program_locate(void)
-{
-	int i;
-
-	boot_device_init();
-
-	for (i = 0; i < ARRAY_SIZE(locators); i++) {
-		if (locators[i]->prepare == NULL)
-			continue;
-		locators[i]->prepare();
-	}
-}