configs: pumpkin: enable HS200

Now that the driver support HS200, we can enable HS200 for the
pumpkin board.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
diff --git a/configs/pumpkin_defconfig b/configs/pumpkin_defconfig
index 2879692..5c5acf2 100644
--- a/configs/pumpkin_defconfig
+++ b/configs/pumpkin_defconfig
@@ -56,6 +56,7 @@
 # CONFIG_INPUT is not set
 CONFIG_DM_MMC=y
 # CONFIG_MMC_QUIRKS is not set
+CONFIG_MMC_HS200_SUPPORT=y
 CONFIG_MMC_MTK=y
 CONFIG_DM_ETH=y
 CONFIG_PINCTRL=y