dm: mmc: Enable DM_MMC_OPS by default with DM_MMC

These two options go together and it is best to do the conversion in one
step. So enable DM_MMC_OPS by default if DM_MMC is enabled.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index ba9a723..24f4b28 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -19,6 +19,7 @@
 config DM_MMC_OPS
 	bool "Support MMC controller operations using Driver Model"
 	depends on DM_MMC
+	default y if DM_MMC
 	help
 	  Driver model provides a means of supporting device operations. This
 	  option moves MMC operations under the control of driver model. The