ARM: multi_v7_defconfig: Add Atmel SDHCI device

The AT91 SDHCI device has been introduced with Atmel SAMA5D2 SoC.
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/configs/multi_v7_defconfig

@@ -526,6 +526,7 @@ CONFIG_MMC_ARMMMCI=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_PLTFM=y
 CONFIG_MMC_SDHCI_OF_ARASAN=y
+CONFIG_MMC_SDHCI_OF_AT91=y
 CONFIG_MMC_SDHCI_ESDHC_IMX=y
 CONFIG_MMC_SDHCI_DOVE=y
 CONFIG_MMC_SDHCI_TEGRA=y