Add cli_ prefix to readline functions

This makes it clear where the code resides.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cli_hush.c b/common/cli_hush.c
index 91e4956..a612bfb 100644
--- a/common/cli_hush.c
+++ b/common/cli_hush.c
@@ -1007,9 +1007,9 @@
 #endif
 	i->__promptme = 1;
 	if (i->promptmode == 1) {
-		n = readline(CONFIG_SYS_PROMPT);
+		n = cli_readline(CONFIG_SYS_PROMPT);
 	} else {
-		n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
+		n = cli_readline(CONFIG_SYS_PROMPT_HUSH_PS2);
 	}
 #ifdef CONFIG_BOOT_RETRY_TIME
 	if (n == -2) {