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/cardhu_defconfig b/configs/cardhu_defconfig
index c95ed03..44955fa 100644
--- a/configs/cardhu_defconfig
+++ b/configs/cardhu_defconfig
@@ -29,6 +29,7 @@
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_SPL_DM=y
 # CONFIG_BLK is not set
+# CONFIG_DM_MMC_OPS is not set
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_RTL8169=y