MAX7301 GPIO: Do not force SPI speed when using OF Platform

The bit_per_word can be set in the OF Device tree, so no need to force it as with
the platform_data when using OF Platform

Signed-off-by: Patrick Vasseur <patrick.vasseur@c-s.fr>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-max7301.c b/drivers/gpio/gpio-max7301.c
index 6e1c984..3b16ab7 100644
--- a/drivers/gpio/gpio-max7301.c
+++ b/drivers/gpio/gpio-max7301.c
@@ -56,7 +56,8 @@
 	int ret;
 
 	/* bits_per_word cannot be configured in platform data */
-	spi->bits_per_word = 16;
+	if (spi->dev.platform_data)
+		spi->bits_per_word = 16;
 	ret = spi_setup(spi);
 	if (ret < 0)
 		return ret;