stv0991: move OF_CONTROL config to defconfig

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
Reviewed-by: Jagannadh Teki <jteki@openedev.com>
diff --git a/configs/stv0991_defconfig b/configs/stv0991_defconfig
index 731ede1..3bdb1fc 100644
--- a/configs/stv0991_defconfig
+++ b/configs/stv0991_defconfig
@@ -11,3 +11,4 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_NETDEVICES=y
 CONFIG_ETH_DESIGNWARE=y
+CONFIG_OF_CONTROL=y