ARM: multi_v7_defconfig: Fix SPI_STM32_QSPI support

SPI_STM32_QSPI must be set in buildin as rootfs can be
located on QSPI memory device.

Link: https://lore.kernel.org/r/20191004124025.17394-1-patrice.chotard@st.com
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/configs/multi_v7_defconfig

@@ -415,7 +415,7 @@ CONFIG_SPI_SH_MSIOF=m
 CONFIG_SPI_SH_HSPI=y
 CONFIG_SPI_SIRF=y
 CONFIG_SPI_STM32=m
-CONFIG_SPI_STM32_QSPI=m
+CONFIG_SPI_STM32_QSPI=y
 CONFIG_SPI_SUN4I=y
 CONFIG_SPI_SUN6I=y
 CONFIG_SPI_TEGRA114=y