ARM: multi_v7_defconfig: enable STM32 DMAv2, DMAMUX and MDMA

This enables drivers for STM32:
 - DMAv2
 - DMMAUX
 - MDMA
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/configs/multi_v7_defconfig

@@ -893,6 +893,9 @@ CONFIG_QCOM_BAM_DMA=y
 CONFIG_XILINX_DMA=y
 CONFIG_DMA_SUN6I=y
 CONFIG_ST_FDMA=m
+CONFIG_STM32_DMA=y
+CONFIG_STM32_DMAMUX=y
+CONFIG_STM32_MDMA=y
 CONFIG_STAGING=y
 CONFIG_SENSORS_ISL29018=y
 CONFIG_SENSORS_ISL29028=y