mmc: Remove redundant spi driver bus initialization

In ancient times it was necessary to manually initialize the bus field of an
spi_driver to spi_bus_type. These days this is done in spi_driver_register(),
so we can drop the manual assignment.

The patch was generated using the following coccinelle semantic patch:
// <smpl>
@@
identifier _driver;
@@
struct spi_driver _driver = {
	.driver = {
-		.bus = &spi_bus_type,
	},
};
// </smpl>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/mmc_spi.c

@@ -1525,7 +1525,6 @@ static struct of_device_id mmc_spi_of_match_table[] __devinitdata = {
 static struct spi_driver mmc_spi_driver = {
 	.driver = {
 		.name =		"mmc_spi",
-		.bus =		&spi_bus_type,
 		.owner =	THIS_MODULE,
 		.of_match_table = mmc_spi_of_match_table,
 	},