mmc: constify mmc_host_ops vectors

Now that mmc_host_ops can be constified, update the various drivers
to constify those method tables and shrink the writable data segment.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/omap.c b/drivers/mmc/omap.c
index 762fa28..895d487 100644
--- a/drivers/mmc/omap.c
+++ b/drivers/mmc/omap.c
@@ -960,7 +960,7 @@
 	return host->wp_pin && omap_get_gpio_datain(host->wp_pin);
 }
 
-static struct mmc_host_ops mmc_omap_ops = {
+static const struct mmc_host_ops mmc_omap_ops = {
 	.request	= mmc_omap_request,
 	.set_ios	= mmc_omap_set_ios,
 	.get_ro		= mmc_omap_get_ro,