video: Add video command with subcommands

Add a new 'video' command with 'setcursor' and 'puts' subcommands that
provide an alternative interface to the existing setcurs and lcdputs
commands.

Update the test is updated to test both the legacy commands and the new
'video' command.

Series-changes: 2
- Correct confusing output text which should be 16 instead of 10
- Improve docs for row and col

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

cmd/video.c

@@ -58,3 +58,11 @@ U_BOOT_CMD(
 	"print string on video framebuffer",
 	"    <string>"
 );
+
+U_BOOT_LONGHELP(video,
+	"setcursor <col> <row> - Set cursor position\n"
+	"video puts <string>         - Write string at current position");
+
+U_BOOT_CMD_WITH_SUBCMDS(video, "Video commands", video_help_text,
+	U_BOOT_SUBCMD_MKENT(setcursor, 3, 1, do_video_setcursor),
+	U_BOOT_SUBCMD_MKENT(puts, 2, 1, do_video_puts));