env: Drop env_crc_update()

This function is not defined or used in U-Boot. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

include/environment.h

@@ -265,9 +265,6 @@ struct env_driver {
 
 extern struct hsearch_data env_htab;
 
-/* Function that updates CRC of the enironment */
-void env_crc_update(void);
-
 /* Look up the variable from the default environment */
 char *env_get_default(const char *name);