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>
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