tty: serial: meson: enable console as module

Enable serial driver to be built as a module.  To do so, init the
console support on driver/module load instead of using
console_initcall().
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20201211005744.12855-1-khilman@baylibre.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/Kconfig

@@ -206,7 +206,7 @@ config SERIAL_MESON
 
 config SERIAL_MESON_CONSOLE
 	bool "Support for console on meson"
-	depends on SERIAL_MESON=y
+	depends on SERIAL_MESON
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
 	help

drivers/tty/serial/meson_uart.c

@@ -604,7 +604,6 @@ static int __init meson_serial_console_init(void)
 	register_console(&meson_serial_console);
 	return 0;
 }
-console_initcall(meson_serial_console_init);
 
 static void meson_serial_early_console_write(struct console *co,
 					     const char *s,
@@ -634,6 +633,9 @@ OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart",
 
 #define MESON_SERIAL_CONSOLE	(&meson_serial_console)
 #else
+static int __init meson_serial_console_init(void) {
+	return 0;
+}
 #define MESON_SERIAL_CONSOLE	NULL
 #endif
 
@@ -824,6 +826,10 @@ static int __init meson_uart_init(void)
 {
 	int ret;
 
+	ret = meson_serial_console_init();
+	if (ret)
+		return ret;
+	
 	ret = uart_register_driver(&meson_uart_driver);
 	if (ret)
 		return ret;