ARM: multi_v7_defconfig: add STM32 CEC support

Enable CEC support for STMicroelectronics as loadable module.
Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Link: https://lore.kernel.org/r/20210129084842.29123-1-alexandre.torgue@foss.st.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

@@ -661,6 +661,7 @@ CONFIG_V4L_TEST_DRIVERS=y
 CONFIG_VIDEO_VIVID=m
 CONFIG_CEC_PLATFORM_DRIVERS=y
 CONFIG_CEC_SAMSUNG_S5P=m
+CONFIG_CEC_STM32=m
 CONFIG_VIDEO_ADV7180=m
 CONFIG_VIDEO_ADV7604=m
 CONFIG_VIDEO_ADV7604_CEC=y