Split out simple parser and readline into separate files

It doesn't make sense to have the simple parser and the readline code
all in main. Split them out into separate files.

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

include/cli.h

@@ -99,4 +99,9 @@ int readline_into_buffer(const char *const prompt, char *buffer, int timeout);
  */
 int 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