tty: serial: meson: Add a earlycon for the S4 SoC

The new Amlogic S4 SoC does not have a always-on uart, so add
OF_EARLYCON_DECLARE for it.
Amlogic T7 will use this as fallback.

Signed-off-by: Lucas Tanure <tanure@linux.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231009121151.4509-1-tanure@linux.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/meson_uart.c

@@ -646,8 +646,8 @@ meson_serial_early_console_setup(struct earlycon_device *device, const char *opt
 	return 0;
 }
 
-OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart",
-		    meson_serial_early_console_setup);
+OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart", meson_serial_early_console_setup);
+OF_EARLYCON_DECLARE(meson, "amlogic,meson-s4-uart", meson_serial_early_console_setup);
 
 #define MESON_SERIAL_CONSOLE_PTR(_devname) (&meson_serial_console_##_devname)
 #else