Rename bootretry functions and remove #ifdefs

Add a bootretry_ prefix to these two functions, and remove the need for
the #ifdef around everything (it moves to the Makefile).

Signed-off-by: Simon Glass <sjg@chromium.org>

include/cli.h

@@ -100,9 +100,6 @@ int cli_readline_into_buffer(const char *const prompt, char *buffer,
  */
 int cli_simple_parse_line(char *line, char *argv[]);
 
-/** bootretry_dont_retry() - Indicate that we should not retry the boot */
-void bootretry_dont_retry(void);
-
 #define endtick(seconds) (get_ticks() + (uint64_t)(seconds) * get_tbclk())
 
 #endif