stm32f7: sdram: move sdram driver code to ram drivers area

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
cc: Christophe KERELLO <christophe.kerello@st.com>
diff --git a/configs/stm32f746-disco_defconfig b/configs/stm32f746-disco_defconfig
index ea98391..57a0d61 100644
--- a/configs/stm32f746-disco_defconfig
+++ b/configs/stm32f746-disco_defconfig
@@ -43,3 +43,9 @@
 CONFIG_STM32_QSPI=y
 CONFIG_OF_LIBFDT_OVERLAY=y
 # CONFIG_EFI_LOADER is not set
+CONFIG_CLK=y
+CONFIG_PINCTRL=y
+# CONFIG_PINCTRL_FULL is not set
+CONFIG_PINCTRL_STM32=y
+CONFIG_RAM=y
+CONFIG_STM32_SDRAM=y