ARM: multi_v7_defconfig: enable sound driver for Midas platform

Sound driver for Midas platform (Exnyos4412 SoC based) has been recently
merged, so enable it for tests like other sound drivers for Exynos based
boards.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20201009134907.4578-1-m.szyprowski@samsung.com


Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>