serial: mctrl_gpio: export mctrl_gpio_disable_ms and mctrl_gpio_init

BugLink: http://bugs.launchpad.net/bugs/1768825

commit 4f71a2e0 upstream.

To be able to make use of the mctrl-gpio helper from a module these
functions must be exported. This was forgotten in the commit introducing
support interrupt handling for these functions (while it was done for
mctrl_gpio_enable_ms, *sigh*).

Fixes: ce59e48f ("serial: mctrl_gpio: implement interrupt handling")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Daniel Wagner <wagi@monom.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/tty/serial/serial_mctrl_gpio.c

@@ -193,6 +193,7 @@ struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx)
 
 	return gpios;
 }
+EXPORT_SYMBOL_GPL(mctrl_gpio_init);
 
 void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
 {
@@ -247,3 +248,4 @@ void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
 		disable_irq(gpios->irq[i]);
 	}
 }
+EXPORT_SYMBOL_GPL(mctrl_gpio_disable_ms);