ARM: multi_v7_defconfig: enable STM32 DRM and MIPI DSI support

Enable DRM and MIPI DSI support for STMicroelectronics as loadable module.
Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/configs/multi_v7_defconfig

@@ -626,6 +626,8 @@ CONFIG_DRM_SII9234=m
 CONFIG_DRM_I2C_ADV7511=m
 CONFIG_DRM_I2C_ADV7511_AUDIO=y
 CONFIG_DRM_STI=m
+CONFIG_DRM_STM=m
+CONFIG_DRM_STM_DSI=m
 CONFIG_DRM_VC4=m
 CONFIG_DRM_ETNAVIV=m
 CONFIG_DRM_MXSFB=m