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/configs/harmony_defconfig b/configs/harmony_defconfig
index 5041768..e1691f6 100644
--- a/configs/harmony_defconfig
+++ b/configs/harmony_defconfig
@@ -28,6 +28,7 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_SPL_DM=y
 # CONFIG_BLK is not set
+# CONFIG_DM_MMC_OPS is not set
 CONFIG_DM_PMIC=y
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y