display_options: Drop two spaces before the ASCII column

At present with print_buffer() U-Boot shows four spaces between the hex
and ASCII data. Two seems enough and matches print_hex_dump(). Change it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/rtc.c b/test/dm/rtc.c
index 8ab997c..c7f9f8f 100644
--- a/test/dm/rtc.c
+++ b/test/dm/rtc.c
@@ -204,7 +204,7 @@
 	ut_assert_console_end();
 
 	run_command("rtc read 0x30 2", 0);
-	ut_assert_nextline("00000030: aa bb                                              ..");
+	ut_assert_nextline("00000030: aa bb                                            ..");
 	ut_assert_console_end();
 
 	run_command("rtc dev 1", 0);
@@ -215,7 +215,7 @@
 	ut_assert_console_end();
 
 	run_command("rtc read 0x30 2", 0);
-	ut_assert_nextline("00000030: cc dd                                              ..");
+	ut_assert_nextline("00000030: cc dd                                            ..");
 	ut_assert_console_end();
 
 	/*
@@ -227,7 +227,7 @@
 	ut_assert_console_end();
 
 	run_command("rtc read 0x30 2", 0);
-	ut_assert_nextline("00000030: aa bb                                              ..");
+	ut_assert_nextline("00000030: aa bb                                            ..");
 	ut_assert_console_end();
 
 	return 0;